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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]          
Foreign currency transaction gain $ 21.8        
Deferred tax liability 13.2   $ 34.8 $ 13.2  
Valuation allowance 169.1   181.0 169.1  
Other Noncash Income Tax Expense   $ 53.7      
Net operating loss carryforwards     219.7    
Net operating loss carryforwards not subject to expiration     134.0    
Income taxes paid     181.4 144.4 $ 101.6
Unrecognized income tax benefits that would affect effective tax rate 210.7   227.9 210.7  
Accrued or deferred taxes relating to uncertain income tax positions 51.0   57.1 51.0  
Interest and penalties related to unrecognized tax benefits     7.1 1.8  
Accrued interest and penalties relating to unrecognized tax benefits $ 28.4   39.4 28.4  
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Income Tax Expense (Benefit)     187.7 180.8 110.9
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount     37.2 3.2 8.5
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount     0.0 21.8 $ 8.4
Indirect favorable effects relating to other tax jurisdictions     64.1 $ 44.9  
Guarantees [Abstract]          
Income tax examination, penalties and interest accrued     57.1    
Change In tax Positions And Judgements And Lapses Of Statutes Of Limitations          
Income Taxes [Line Items]          
Indirect favorable effects relating to other tax jurisdictions     13.1    
Foreign          
Income Taxes [Line Items]          
Net operating loss carryforwards     219.7    
2021          
Income Taxes [Line Items]          
Net operating loss carryforwards, by expiration date     24.0    
2022          
Income Taxes [Line Items]          
Net operating loss carryforwards, by expiration date     15.0    
2023          
Income Taxes [Line Items]          
Net operating loss carryforwards, by expiration date     $ 46.7