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Share-Based Compensation - Restricted Stock (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award      
Weighted average period for recognition (in years) 3 years    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Award fair value $ 50.7 $ 8.0 $ 53.5
Vesting Period     6 years
Units granted 300,000   100,000.0
Market Condition 1     15.00%
Market Condition 2     25.00%
Market Condition 3     35.00%
Expected volatility     31.60%
Risk-free interest rate     2.00%
Dividend yield     0.00%
Weighted average period for recognition (in years)     4 years
Options available for future grant under the Company's option plans (in shares) 1,500,000.0    
Restricted Stock | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting Period 3 years    
Restricted Stock | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting Period 8 years