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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Income Tax Contingency [Line Items]    
Unrecognized income tax benefits that would affect effective tax rate $ 253.1 $ 227.9
Unrecognized tax benefits 62.1 64.1
Accrued or deferred taxes relating to uncertain income tax positions 50.8 57.1
Accrued interest and penalties relating to unrecognized tax benefits 41.7 39.4
Decrease in valuation allowance 67.8  
Foreign Tax Authority    
Income Tax Contingency [Line Items]    
Cash 6.8  
Other noncurrent liabilities    
Income Tax Contingency [Line Items]    
Noncurrent liability for uncertain tax positions 201.5 163.8
Deferred tax liabilities    
Income Tax Contingency [Line Items]    
Noncurrent liability for uncertain tax positions $ 0.8 $ 7.0