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Employee Benefit Plans UK Pension Assets, Fair Value Measurement by Input Level (Details) - Foreign Plan - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets $ 217.0 $ 253.5  
Fair Value, Inputs, Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 84.0 98.8  
Fair Value, Inputs, Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Fair Value, Inputs, Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 133.0 154.7  
Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 217.0 253.5 $ 228.4
Diversified Growth Assets      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 133.0 154.7  
Diversified Growth Assets | Fair Value, Inputs, Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Diversified Growth Assets | Fair Value, Inputs, Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Diversified Growth Assets | Fair Value, Inputs, Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Diversified Growth Assets | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 133.0 154.7  
Fixed Interest and Index-linked Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 81.3 98.4  
Fixed Interest and Index-linked Securities | Fair Value, Inputs, Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 81.3 98.4  
Fixed Interest and Index-linked Securities | Fair Value, Inputs, Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Fixed Interest and Index-linked Securities | Fair Value, Inputs, Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Fixed Interest and Index-linked Securities | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Cash Equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 2.7 0.4  
Cash Equivalents | Fair Value, Inputs, Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 2.7 0.4  
Cash Equivalents | Fair Value, Inputs, Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Cash Equivalents | Fair Value, Inputs, Level 3      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets 0.0 0.0  
Cash Equivalents | Fair Value Measured at Net Asset Value Per Share      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Fair Value of Plan Assets $ 0.0 $ 0.0