| Share-based Arrangements with Employees and Nonemployees [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Share-based Arrangements with Employees and Nonemployees [Abstract] | |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The following table summarizes the expenses recognized for the years ended December 31: | | | | | | | | | | | | | | In millions | | 2016 | | 2015 | | 2014 | Stock options | | $ | 4.1 |
| | $ | 3.7 |
| | $ | 3.3 |
| RSUs | | 7.7 |
| | 5.8 |
| | 6.0 |
| PSUs | | 4.8 |
| | 5.0 |
| | 3.9 |
| Deferred compensation | | 0.8 |
| | 0.3 |
| | 0.8 |
| Pre-tax expense | | 17.4 |
| | 14.8 |
| | 14.0 |
| Tax benefit | | (5.6 | ) | | (4.4 | ) | | (4.7 | ) | Total | | $ | 11.8 |
| | $ | 10.4 |
| | $ | 9.3 |
|
|
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | The weighted average assumptions used were the following: | | | | | | | | | | 2016 | | 2015 | Dividend yield | | 0.83 | % | | 0.69 | % | Volatility | | 28.85 | % | | 31.37 | % | Risk-free rate of return | | 1.38 | % | | 1.78 | % | Expected life | | 6.0 years |
| | 6.0 years |
|
|
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] | Changes in options outstanding under the plans for the years ended December 31, 2016, 2015 and 2014 are as follows: | | | | | | | | | | | | | | | | | Shares subject to option | | Weighted- average exercise price (a) | | Aggregate intrinsic value (millions) | | Weighted- average remaining life (years) | December 31, 2013 | | 2,482,056 |
| | $ | 25.21 |
| | | | | Granted | | 188,817 |
| | 54.07 |
| | | | | Exercised | | (683,383 | ) | | 24.18 |
| | | | | Canceled | | (25,462 | ) | | 43.89 |
| | | | | December 31, 2014 | | 1,962,028 |
| | 28.11 |
| | | | | Granted | | 220,679 |
| | 57.85 |
| | | | | Exercised | | (575,564 | ) | | 22.98 |
| | | | | Canceled | | (14,976 | ) | | 47.28 |
| | | | | December 31, 2015 | | 1,592,167 |
| | 33.91 |
| | | | | Granted | | 231,521 |
| | 57.91 |
| | | | | Exercised | | (447,019 | ) | | 26.04 |
| | | | | Canceled | | (63,599 | ) | | 53.40 |
| | | | | Outstanding December 31, 2016 | | 1,313,070 |
| | $ | 39.87 |
| | $ | 31.7 |
| | 5.5 | Exercisable December 31, 2016 | | 929,677 |
| | $ | 32.64 |
| | $ | 29.2 |
| | 4.4 |
| | (a) | The weighted average exercise price of awards represents the exercise price of the awards on the grant date converted to ordinary shares of the Company. |
|
Schedule of Share-based Compensation, Activity [Table Text Block] | The following table summarizes information concerning currently outstanding and exercisable options: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Options outstanding | | Options exercisable | Range of exercise price | | Number outstanding at December 31, 2016 | | Weighted- average remaining life (years) | | Weighted- average exercise price | | Number outstanding at December 31, 2016 | | Weighted- average remaining life (years) | | Weighted- average exercise price | $ | 10.01 |
| | — | | $ | 20.00 |
| | 149,389 |
| | 2.3 | | $ | 14.87 |
| | 149,389 |
| | 2.3 |
| | $ | 14.87 |
| 20.01 |
| | — | | 30.00 |
| | 344,376 |
| | 2.8 | | 25.93 |
| | 344,376 |
| | 2.8 |
| | 25.93 |
| 30.01 |
| | — | | 40.00 |
| | 139,747 |
| | 5.0 | | 32.31 |
| | 139,747 |
| | 5.0 |
| | 32.31 |
| 40.01 |
| | — | | 50.00 |
| | 145,062 |
| | 7.0 | | 43.37 |
| | 145,062 |
| | 7.0 |
| | 43.37 |
| 50.01 |
| | — | | 60.00 |
| | 533,234 |
| | 8.0 | | 56.84 |
| | 151,103 |
| | 6.8 |
| | 55.49 |
| 60.01 |
| | — | | 70.00 |
| | 631 |
| | 9.8 | | 63.93 |
| | — |
| | — |
| | — |
| $ | 70.01 |
| | — | | $ | 80.00 |
| | 631 |
| | 9.6 | | 72.12 |
| | — |
| | — |
| | — |
|
|
| |
| |
|
| | 1,313,070 |
| | 5.6 | | $ | 39.87 |
| | 929,677 |
| | 4.4 |
| | $ | 32.64 |
|
|
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] |
The following table summarizes RSU activity for the years ended December 31, 2016, 2015 and 2014: | | | | | | | | | | | RSUs | | Weighted- average grant date fair value (a) | Outstanding and unvested at December 31, 2013 | | 378,217 |
| | $ | 33.59 |
| Granted | | 101,654 |
| | 54.29 |
| Vested | | (149,392 | ) | | 28.68 |
| Canceled | | (5,319 | ) |
| 43.66 |
| Outstanding and unvested at December 31, 2014 | | 325,160 |
| | 42.15 |
| Granted | | 121,153 |
| | 59.69 |
| Vested | | (92,029 | ) | | 36.63 |
| Canceled | | (9,354 | ) | | 49.32 |
| Outstanding and unvested at December 31, 2015 | | 344,930 |
| | 49.59 |
| Granted | | 123,299 |
| | 59.49 |
| Vested | | (220,854 | ) | | 45.83 |
| Canceled | | (41,741 | ) | | 52.40 |
| Outstanding and unvested at December 31, 2016 | | 205,634 |
| | $ | 58.99 |
|
|
Schedule of Share-based Compensation, Performance Shares [Table Text Block] | The following table summarizes PSU activity for the maximum number of shares that may be issued for the years ended December 31, 2016, 2015 and 2014: | | | | | | | | | | | PSUs | | Weighted-average grant date fair value (a) | Outstanding and unvested at December 31, 2013 | | 62,883 |
| | $ | 29.27 |
| Granted | | 110,387 |
| | 72.70 |
| Forfeited | | (12,138 | ) | | 50.96 |
| Outstanding and unvested at December 31, 2014 | | 161,132 |
| | 57.39 |
| Granted | | 58,323 |
| | 66.47 |
| Vested | | (17,327 | ) | | 75.05 |
| Forfeited | | (85 | ) | | 75.05 |
| Outstanding and unvested at December 31, 2015 | | 202,043 |
| | 64.92 |
| Granted | | 94,201 |
| | 64.83 |
| Vested | | (64,979 | ) | | 72.69 |
| Forfeited | | (21,661 | ) | | 57.07 |
| Outstanding and unvested at December 31, 2016 | | 209,604 |
| | $ | 56.02 |
|
|
