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Employee Benefit Plans - Summary of the Sensitivity of Retirement Obligations and Retirement Benefit Costs of Plans to Changes in the Key Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Pension Plans    
Estimated increase (decrease) in 2019 pension cost    
0.50% increase in discount rate $ (0.8)  
0.50% decrease in discount rate 0.9  
0.50% increase in long-term return on assets (0.6)  
0.50% decrease in long-term return on assets 0.6  
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2018    
0.50% increase in discount rate   $ (12.5)
0.50% decrease in discount rate   13.7
Postretirement Medical and Other    
Estimated increase (decrease) in 2019 pension cost    
0.50% increase in discount rate 0.1  
0.50% decrease in discount rate $ (0.1)  
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2018    
0.50% increase in discount rate   (0.6)
0.50% decrease in discount rate   $ 0.7