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Income Taxes (Summary of Income Tax Contingencies) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Gross unrecognized tax benefits:    
Gross unrecognized income tax benefits, beginning of period $ 166.1 $ 163.4
Additions for tax positions of the current year 32.8 3.8
Additions for tax positions of prior years 20.7 13.1
Reductions for tax positions of prior years for:    
Changes in judgments (4.6) (1.6)
Settlements during the year (0.7) (0.7)
Lapses of applicable statute of limitations (0.8) (4.4)
Gross unrecognized income tax benefits, end of period 210.7 166.1
Unrecognized Tax Benefits, Foreign Currency Translation $ 2.8 $ 7.5