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Retirement Benefits - Venezuela Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
USD ($)
VEF / $
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
VEF / $
Dec. 31, 2032
Mar. 31, 2016
VEF / $
Non-U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Projected benefit obligations   $ 267.3 $ 262.8 $ 283.1    
Net periodic pension cost   $ 21.7 $ 23.7 $ 26.1    
Discount rate   3.70% 5.10% 5.10%    
Projected benefit payments   $ 232.3 $ 226.5      
Venezuela            
Defined Benefit Plan Disclosure [Line Items]            
Decline in rate   59.00%        
Exchange rate remeasurement | VEF / $   674   6.3   273
Venezuela | Non-U.S. Plans            
Defined Benefit Plan Disclosure [Line Items]            
Projected benefit obligations   $ 5.6 4.1 $ 6.6    
Net periodic pension cost   $ 2.9 $ 2.5 $ 3.7    
Discount rate   4.00%        
Projected benefit payments   $ 4,400.0        
Venezuelan bolívar fuerte | Venezuela            
Defined Benefit Plan Disclosure [Line Items]            
Exchange rate remeasurement | VEF / $   674        
Venezuelan bolívar fuerte | Forecast | Venezuela            
Defined Benefit Plan Disclosure [Line Items]            
Inflation rate 500.00%          
Decline in rate         4.00%