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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, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Line Items]            
Foreign currency transaction gain $ 21.8          
Provision in accordance with Staff Accounting Bulletin No. 118     $ 42.0      
Deferred tax liability 13.2     $ 13.2 $ 11.4  
Valuation allowance 169.1     169.1 83.9  
Other Noncash Income Tax Expense   $ 53.7        
Net operating loss carryforwards 236.4     236.4    
Net operating loss carryforwards not subject to expiration 176.4     176.4    
Income taxes paid       144.4 101.6 $ 111.2
Unrecognized income tax benefits that would affect effective tax rate 210.7     210.7 166.1  
Accrued or deferred taxes relating to uncertain income tax positions 51.0     51.0 58.5  
Interest and penalties related to unrecognized tax benefits       1.8 5.6  
Accrued interest and penalties relating to unrecognized tax benefits 28.4     28.4 27.2  
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Income Tax Expense (Benefit)       180.8 110.9 133.6
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount       3.2 8.5 3.8
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Amount       (21.8) $ (8.4) $ 42.0
Indirect favorable effects relating to other tax jurisdictions       44.9    
Guarantees [Abstract]            
Guaranteed indebtedness owed to third parties 66.6     66.6    
Income tax examination, penalties and interest accrued 51.0     51.0    
Foreign            
Income Taxes [Line Items]            
Net operating loss carryforwards 236.4     236.4    
2020            
Income Taxes [Line Items]            
Net operating loss carryforwards, by expiration date 24.4     24.4    
2021            
Income Taxes [Line Items]            
Net operating loss carryforwards, by expiration date 21.3     21.3    
2022            
Income Taxes [Line Items]            
Net operating loss carryforwards, by expiration date $ 14.3     $ 14.3