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Employee Retirement Benefits - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Provision for defined contribution plans $ 10.5 $ 9.4 $ 7.5
Increase to the pension liability funded status   3.6  
Defined Benefit Plan, Actual Benefit Plan Obligation Allocations 98.00%    
Offset to taxes   2.0  
Effect of 1% increase in postretirement benefit obligation (less than) $ 0.1    
Net actuarial loss $ 1.2    
Asset allocation percentage 100.00%    
Qualified Pension Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Increase to the pension liability funded status $ 1.5 $ (3.6)  
Expected return on assets 0.00% 0.00% 0.00%
Equity Securities [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Asset allocation percentage 35.00%    
Fixed Income Securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Asset allocation percentage 65.00%