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Share-Based Compensation - Restricted Stock (Details) - Restricted Stock - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award      
Award fair value $ 28.0 $ 50.7 $ 8.0
Options available for future grant under the Company's option plans (in shares) 1,300,000.0    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting Period 4 years