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Stock-Based Compensation (Net Tax Windfall) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Balance at December 31, 2012
Dec. 31, 2013
Net Windfall Resulting From Exercises and Conversions
Dec. 31, 2013
Balance at December 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accumulated tax windfall in additional contributed capital $ 36.2 $ 5.7 $ 41.9