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Income Taxes Change in Valuation Allowances (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Oct. 01, 2018
Summary of Valuation Allowances        
Net impact of the Tax Act $ 0.0 $ 0.0 $ 13.4  
Beginning balance 164.2 211.0 243.0  
Charged (reversed ) to costs and expenses 17.3 (24.9) (28.0)  
Charged (reversed) to gross tax assets and other accounts 1 [1] 9.9 (19.8) 5.1  
Foreign currency translation 5.7 (2.1) (9.1)  
Ending balance 197.1 164.2 211.0  
Foreign Income Tax Expense (Benefit), Continuing Operations 75.8 83.7 $ 102.7  
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]        
Operating Loss Carryforwards   1,188.8    
Undistributed Earnings of Foreign Subsidiaries 1,080.2 1,199.7   $ 435.0
Other Tax Expense (Benefit)   10.8    
Changes in non-US tax law [Member]        
Summary of Valuation Allowances        
Foreign Income Tax Expense (Benefit), Continuing Operations 10.4      
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]        
Undistributed Earnings of Foreign Subsidiaries 120.0      
Restructuring actions taken within foreign subsidiaries [Member]        
Summary of Valuation Allowances        
Foreign Income Tax Expense (Benefit), Continuing Operations 3.2      
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]        
Undistributed Earnings of Foreign Subsidiaries $ 46.0      
Foreign Tax Authority        
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]        
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration   1,035.3    
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   153.5    
State and Local Jurisdiction        
Deferred Tax Assets, Operating Loss Carryforwards, Components [Abstract]        
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration   $ 31.4    
[1] Primarily represents changes to the valuation allowance related to the change of a corresponding deferred tax asset.