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Income Taxes Change in Valuation Allowances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Oct. 01, 2018
Summary of Valuation Allowances        
Net impact of the Tax Act $ 0.0 $ 13.4 $ (36.0)  
Beginning balance 211.0 243.0 255.6  
Reversed to costs and expenses (24.9) (28.0) (4.6)  
(Reversed) charged to gross tax assets and other accounts 1 [1] (19.8) 5.1 (27.3)  
Foreign currency translation (2.1) (9.1) 19.3  
Ending balance 164.2 211.0 $ 243.0  
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]        
Operating Loss Carryforwards   1,044.1    
Undistributed Earnings of Foreign Subsidiaries $ 1,199.7 1,079.1   $ 435.0
Other Tax Expense (Benefit)   10.8    
Foreign Tax Authority        
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]        
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration   939.0    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   105.1    
State and Local Jurisdiction        
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]        
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   $ 25.6    
[1]
Primarily represents changes to the valuation allowance related to the change of a corresponding deferred tax asset.