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Share-Based Compensation - Summary of Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-based compensation $ 9.2 $ 8.0  
Tax benefit 3.6 $ 3.1  
Compensation expense related to share-based compensation $ 105.0   $ 70.6
Weighted average period over which compensation expense will be recognized 3 years