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Share-Based Compensation - Summary of Share-Based Compensation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]          
Share-based compensation $ 8.7 $ 5.7 $ 15.2 $ 11.5  
Tax benefit 3.4 2.2 5.8 4.4  
Share-based Compensation [Abstract]          
Compensation expense related to share-based compensation $ 70.5   $ 70.5   $ 79.3
Weighted average period over which compensation expense will be recognized     3 years