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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]      
Deferred tax liability $ 12.7    
Undistributed earnings of foreign subsidiaries $ 2,500.0    
Federal statutory income tax rate 35.00% 35.00% 35.00%
Deferred tax assets   $ (14.3)  
Valuation allowance $ 116.0 75.8  
Net operating loss carryforwards 286.4    
Net operating loss carryforwards not subject to expiration 179.3    
Income taxes paid 106.2 97.6 $ 223.6
Unrecognized income tax benefits that would affect effective tax rate 139.9 133.0  
Accrued or deferred taxes relating to uncertain income tax positions 47.0 61.2  
Interest and penalties related to unrecognized tax benefits 3.4 5.1  
Accrued interest and penalties relating to unrecognized tax benefits 16.4 $ 18.3  
Foreign      
Income Taxes [Line Items]      
Net operating loss carryforwards 286.4    
2017      
Income Taxes [Line Items]      
Net operating loss carryforwards, by expiration date 27.3    
2018      
Income Taxes [Line Items]      
Net operating loss carryforwards, by expiration date 38.0    
2019      
Income Taxes [Line Items]      
Net operating loss carryforwards, by expiration date $ 41.8