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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Examination [Line Items]      
Income tax (payable) $ (143.0)    
Income taxes receivable   $ 13.0  
Net operating loss carryforwards 130.0 223.0  
Foreign net operating loss carryforwards resulting in deferred tax assets 86.0 174.0  
Foreign tax credit carryforwards 3.0 1.0  
Undistributed earnings of foreign subsidiaries 930.0 813.0  
Unrecognized tax benefits 75.0 87.0 $ 98.0
Unrecognized tax benefits that would impact tax rate 56.0 67.0  
Tax benefits interest expense for unpaid taxes 5.0 6.0 $ 2.0
Unrecognized tax benefits interest and penalties accrued 22.0 25.0  
Unrecognized tax benefits that may be recognized during the next twelve month period $ 3.0    
Recognition period 12 months    
Tax Act, re-measurement of deferred tax liabilities, tax benefit $ 772.0    
Tax Act, one-time deemed repatriation tax, tax expense 68.0    
Tax Act, release of undistributed foreign earnings liability, tax benefit 30.0    
Foreign taxes, tax benefit 48.0    
Federal and State      
Income Tax Examination [Line Items]      
Net operating loss carryforwards 44.0 49.0  
State and Local Jurisdiction [Member]      
Income Tax Examination [Line Items]      
Valuation allowance against net operating loss deferred tax assets $ 37.0 34.0  
Foreign Tax Authority [Member]      
Income Tax Examination [Line Items]      
Valuation allowance against net operating loss deferred tax assets   $ 143.0