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Income Taxes Uncertain Income Tax Positions (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
USD ($)
jurisdiction
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Income Tax Contingency [Line Items]            
Number of significant foreign jurisdictions | jurisdiction       16    
Unrecognized tax benefits $ 79.1 $ 111.6 $ 111.6 $ 79.1 $ 84.0 $ 111.6
Unrecognized tax benefits that would impact effective tax rate       29.5 22.5  
Interest and penalties recognized 0.9 5.2 4.4      
Interest and penalties accrued       14.0 13.1  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]            
Balance at beginning of year 84.0 111.6 97.1      
Increases related to positions taken in the current year 11.8 9.4 22.3      
Decreases related to positions taken in prior years (1.8) (4.6)        
Increases related to positions taken in prior years     2.6      
Decreases related to lapse of statutes of limitations (13.5) (14.2) (10.2)      
Settlements during the current year (1.4) (0.3) (0.2)      
Decreases for tax positions on dispositions 0.0 (17.9) 0.0      
Balance at end of year $ 79.1 $ 84.0 $ 111.6      
Offsetting non-current deferred tax asset       45.3 $ 59.8 $ 74.4
Minimum            
Income Tax Contingency [Line Items]            
Possible decrease in unrecognized tax benefits       10.1    
Maximum            
Income Tax Contingency [Line Items]            
Possible decrease in unrecognized tax benefits       $ 16.5