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Share-Based Compensation - Summary of recent share based compensation expense (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-Based Compensation Expense $ 27.5 $ 25.4 $ 21.2
Tax Benefit $ 10.6 $ 9.6 $ 8.1