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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Line Items]        
Provision in accordance with Staff Accounting Bulletin No. 118 $ 42.0      
Deferred tax liability 11.4 $ 11.4 $ 18.3  
Federal statutory income tax rate   35.00% 35.00% 35.00%
Valuation allowance 83.9 $ 83.9 $ 81.9  
Net operating loss carryforwards 249.6 249.6    
Net operating loss carryforwards not subject to expiration 188.4 188.4    
Income taxes paid   101.6 111.2 $ 106.2
Unrecognized income tax benefits that would affect effective tax rate 166.1 166.1 163.4  
Accrued or deferred taxes relating to uncertain income tax positions 58.5 58.5 61.8  
Interest and penalties related to unrecognized tax benefits   5.6 4.6  
Accrued interest and penalties relating to unrecognized tax benefits 27.2 27.2 23.0  
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Income Tax Expense (Benefit)   110.9 133.6 92.2
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount   8.5 $ 3.8 $ 23.4
Foreign        
Income Taxes [Line Items]        
Net operating loss carryforwards 249.6 249.6    
2019        
Income Taxes [Line Items]        
Net operating loss carryforwards, by expiration date 19.5 19.5    
2020        
Income Taxes [Line Items]        
Net operating loss carryforwards, by expiration date 18.8 18.8    
Operating Loss Carryforwards, By Expiration Date, Date four [Member] [Domain]        
Income Taxes [Line Items]        
Net operating loss carryforwards, by expiration date $ 22.9 $ 22.9