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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)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Pension Plans  
Estimated increase (decrease) in 2020 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 (0.7)
0.50% decrease in long-term return on assets 0.7
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2019  
0.50% increase in discount rate (14.3)
0.50% decrease in discount rate 15.7
Postretirement Medical and Other  
Estimated increase (decrease) in 2020 pension cost  
0.50% decrease in discount rate (0.1)
1% decrease in medical trend rates (0.1)
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2019  
0.50% increase in discount rate (0.6)
0.50% decrease in discount rate 0.6
1% increase in medical trend rates 0.7
1% decrease in medical trend rates $ (0.6)