XBRL Cloud: Business Report

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Network	2413402 - Disclosure - Accumulated Other Comprehensive Income (Loss) (Details) (http://www.atimetals.com/role/AccumulatedOtherComprehensiveIncomeLossDetails)
Table	Accumulated Other Comprehensive Income (Loss) [Table]

Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0001018963 (http://www.sec.gov/CIK)

Accumulated Other Comprehensive Income (Loss) [Line Items]	Period [Axis]
	2016-01-01 - 2016-12-31						2015-01-01 - 2015-12-31						2014-01-01 - 2014-12-31
	Equity Components [Axis]						Equity Components [Axis]						Equity Components [Axis]
	Post- retirement benefit plans [Member]	Currency translation adjustment [Member]	Unrealized holding gains on securities [Member]	Derivatives [Member]	Accumulated Deferred Tax Asset Valuation Allowance [Member]	Equity Component [Domain]	Post- retirement benefit plans [Member]	Currency translation adjustment [Member]	Unrealized holding gains on securities [Member]	Derivatives [Member]	Accumulated Deferred Tax Asset Valuation Allowance [Member]	Equity Component [Domain]	Post- retirement benefit plans [Member]	Currency translation adjustment [Member]	Unrealized holding gains on securities [Member]	Derivatives [Member]	Accumulated Deferred Tax Asset Valuation Allowance [Member]	Equity Component [Domain]
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(951,200,000)	(47,600,000)	0	(15,700,000)	0	(1,014,500,000)	(931,500,000)	(16,200,000)	0	16,300,000	0	(931,400,000)	(718,900,000)	15,300,000	0	(9,600,000)	0	(713,200,000)
OCI before reclassifications	(60,600,000)	(37,400,000)	0	13,200,000	(45,600,000)	(130,400,000)	(69,600,000)	(31,400,000)	0	(20,700,000)	0	(121,700,000)	(266,400,000)	(32,000,000)	0	28,100,000	0	(270,300,000)
Amounts reclassified from AOCI	46,300,000 ³	0 ¹	0 ¹	4,900,000 ²	0	51,200,000	49,900,000 ³	0 ¹	0 ¹	(11,300,000)²	0	38,600,000	53,800,000 ³	500,000 ⁴	0 ¹	(2,200,000)²	0	52,100,000
Net current-period OCI	(14,300,000)	(37,400,000)	0	18,100,000	(45,600,000)	(79,200,000)	(19,700,000)	(31,400,000)	0	(32,000,000)	0	(83,100,000)	(212,600,000)	(31,500,000)	0	25,900,000	0	(218,200,000)
Ending balance	(965,500,000)	(85,000,000)	0	2,400,000	(45,600,000)	(1,093,700,000)	(951,200,000)	(47,600,000)	0	(15,700,000)	0	(1,014,500,000)	(931,500,000)	(16,200,000)	0	16,300,000	0	(931,400,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest [Abstract]
Increase (Decrease) in Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	0	19,400,000	0	0	0	19,400,000	0	25,000,000	0	0	0	25,000,000	0	27,100,000	0	0	0	27,100,000
OCI before reclassifications	0	(9,700,000)	0	0	0	(9,700,000)	0	(5,600,000)	0	0	0	(5,600,000)	0	(2,100,000)	0	0	0	(2,100,000)
Amounts reclassified from AOCI	0	0 ¹	0	0	0	0	0	0 ¹	0	0	0	0	0	0 ¹	0	0	0	0
Net current-period OCI	0	(9,700,000)	0	0	0	(9,700,000)	0	(5,600,000)	0	0	0	(5,600,000)	0	(2,100,000)	0	0	0	(2,100,000)
Ending balance	0	9,700,000	0	0	0	9,700,000	0	19,400,000	0	0	0	19,400,000	0	25,000,000	0	0	0	25,000,000

1: No amounts were reclassified to earnings.
2: Amounts related to the effective portion of the derivatives are included in cost of goods sold in the period or periods the hedged item affects earnings. Amounts related to the ineffective portion of the derivatives are presented in selling and administrative expenses on the consolidated statements of operations (see Note 10).
3: Amounts were included in net periodic benefit cost for pension and other postretirement benefit plans (see Note 12).
4: Amount in 2014 is included in other income, net.