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Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Gross unrecognized tax benefits:    
Gross unrecognized income tax benefits, beginning of period $ 130.6 $ 122.2
Additions for tax positions of the current year 14.4 21.8
Additions for tax positions of prior years 7.1 11.0
Additions for tax positions related to acquisitions 0.0 (0.6)
Reductions for tax positions of prior years for:    
Changes in judgments (0.3) (2.2)
Settlements during the period 0.0 (1.9)
Lapses of applicable statute of limitations (5.8) (5.4)
Foreign currency translation (13.0) (14.3)
Gross unrecognized income tax benefits, end of period $ 133.0 $ 130.6