Rendering

Component: (Network and Table)
Network
2446406 - Disclosure - Share-based Compensation (Schedule of Status of Non-Vested Restricted Stock) (Details)
(http://www.alxn.com/role/ShareBasedCompensationScheduleOfStatusOfNonVestedRestrictedStockDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000899866 (http://www.sec.gov/CIK)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
 
Nonvested restricted stock, beginning of period
2,000,000  
Shares issued
2,000,000  
Shares cancelled
0  
Shares vesting
(1,000,000) 
Nonvested restricted stock, end of period
3,000,000  
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
 
Weighted average grant date fair value
167.21  
Restricted Stock, Grants in Period, Weighted Average Grant Date Fair Value
133.35  
Cancelled, Weighted average grant date fair value
165.23  
Vested, Weighted average grant date fair value
155.03  
Weighted average grant date fair value
149.48