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Income Taxes (Summary of Income Tax Contingencies) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Gross unrecognized tax benefits:    
Gross unrecognized income tax benefits, beginning of period $ 94.5 $ 71.1
Additions for tax positions of the current year 34.7 18.5
Additions for tax positions of prior years 3.6 7.3
Additions for tax positions related to acquisitions 0 1.1
Reductions for tax positions of prior years for:    
Changes in judgments (9.0) 0.2
Settlements during the period 0 0
Lapses of applicable statute of limitations (3.6) (5.2)
Foreign currency translation 2.0 1.5
Gross unrecognized income tax benefits, end of period $ 122.2 $ 94.5