Employee Benefit Plans - Summary of the Sensitivity of Retirement Obligations and Retirement Benefit Costs of Plans to Changes in the Key Assumptions (Details) U_pure in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Estimated increase (decrease) in 2021 pension cost
Defined Benefit Plan Effect Of One Percent Decrease In Discount Rate On Retirement Obligation	$ (0.4)
Pension Plan
Estimated increase (decrease) in 2021 pension cost
0.50% increase in discount rate	(1.0)
0.50% decrease in discount rate	1.1
0.50% increase in long-term return on assets	(0.8)
0.50% decrease in long-term return on assets	0.8
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2019
0.50% increase in discount rate	(14.2)
0.50% decrease in discount rate	$ 15.8
Postretirement Medical and Other
Estimated increase (decrease) in 2021 pension cost
Defined Benefit Plan Effect Of One Percent Increase In Medical Trend Rates On Retirement Benefit Costs In Next Fiscal Year	0.1
Defined Benefit Plan Effect Of One Percent Increase In Discount Rate On Retirement Obligations	0.4
Defined Benefit Plan Effect Of One Percent Decrease In Medical Trend On Retirement Benefit Costs In Next Fiscal Year	(0.1)
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2019
0.50% increase in discount rate	$ (0.4)
0.50% decrease in discount rate	$ 0.4