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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Line Items]        
Provision in accordance with Staff Accounting Bulletin No. 118 $ 42.0      
Provisional income tax charge 14.3      
Tax associated with the mandatory deemed repatriation 3,400.0      
Pre-tax losses associated with the mandatory deemed repatriation of unremitted foreign earnings   $ 49.6    
Provisional income tax charge for consequences associated with expected future repatriation 10.4      
Deferred tax liability 18.3 $ 18.3 $ 12.7  
Federal statutory income tax rate   35.00% 35.00% 35.00%
Valuation allowance 81.9 $ 81.9 $ 116.0  
Benefit from the use of certain tax credits   37.0    
Net operating loss carryforwards 272.3 272.3    
Net operating loss carryforwards not subject to expiration 156.5 156.5    
Income taxes paid   111.2 106.2 $ 97.6
Unrecognized income tax benefits that would affect effective tax rate 163.4 163.4 139.9  
Accrued or deferred taxes relating to uncertain income tax positions 61.8 61.8 47.0  
Interest and penalties related to unrecognized tax benefits   4.6 3.4  
Accrued interest and penalties relating to unrecognized tax benefits 23.0 23.0 $ 16.4  
Foreign        
Income Taxes [Line Items]        
Net operating loss carryforwards 272.3 272.3    
2018        
Income Taxes [Line Items]        
Net operating loss carryforwards, by expiration date 26.5 26.5    
2019        
Income Taxes [Line Items]        
Net operating loss carryforwards, by expiration date 41.1 41.1    
2020        
Income Taxes [Line Items]        
Net operating loss carryforwards, by expiration date $ 48.2 $ 48.2