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Share-Based Compensation - Summary of Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Share-based compensation $ 10.8 $ 9.1 $ 20.0 $ 17.0  
Tax benefit 4.2 $ 3.5 7.7 $ 6.6  
Compensation expense related to share-based compensation $ 94.1   $ 94.1   $ 70.6
Weighted average period over which compensation expense will be recognized     3 years