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Other Postretirement Benefit Plans (Tables) - Postretirement Plan
12 Months Ended
Dec. 31, 2022
Post Retirement Benefit Plans  
Schedule of Defined Benefit Plans Disclosures
The following tables summarize the net periodic benefit cost information and the related assumptions used to measure the net periodic benefit cost for the years ended December 31:
 202220212020
Components of net periodic credit:
Service cost$0.2 $0.2 $0.2 
Interest cost1.4 1.5 2.1 
Expected return on plan assets — (0.4)
Amortization of prior service credit(10.1)(10.1)(9.8)
Recognition of net actuarial (gains) losses(13.1)(4.1)1.4 
Net periodic credit:$(21.6)$(12.5)$(6.5)
Schedule of Defined Benefit Plan, Assumptions
Assumptions:202220212020
Discount rate2.99 %2.62 %3.43 %
Rate of return %— %3.00 %
The following table summarizes assumptions used to measure the benefit obligation for the other postretirement benefit plans at December 31:
Assumptions:20222021
Discount rate5.75 %2.99 %
Schedule of Changes in Projected Benefit Obligations
  
20222021
Change in benefit obligation:
Benefit obligation at beginning of year$51.1 $57.6 
Service cost0.2 0.2 
Interest cost1.4 1.5 
Plan amendments(0.6)— 
Actuarial gains(13.1)(4.1)
International plan exchange rate change(0.1)— 
Benefits paid(3.4)(4.1)
Benefit obligation at end of year$35.5 $51.1 
Schedule of Changes in Fair Value of Plan Assets
Change in plan assets:
Fair value of plan assets at beginning of year$ $11.1 
Transfer to VEBA trust for certain active employees' medical benefits (11.1)
Fair value of plan assets at end of year — 
Funded status at end of year$(35.5)$(51.1)
Schedule of Defined Benefit Plans Amounts recognized on the Consolidated Balance Sheets
Amounts recognized on the Consolidated Balance Sheets:
Current liabilities$(4.1)$(5.3)
Non-current liabilities(31.4)(45.8)
 $(35.5)$(51.1)
Schedule of Defined Benefit Plans Amounts recognized in accumulated other comprehensive income
Amounts recognized in accumulated other comprehensive loss:
Net prior service credit$(71.9)$(81.4)
Accumulated other comprehensive loss$(71.9)$(81.4)
Changes to prior service credit recognized in accumulated other
     comprehensive loss:
Accumulated other comprehensive loss at beginning of year$(81.4)$(91.5)
Prior service credit(0.6)— 
Recognized prior service credit10.1 10.1 
Total recognized in accumulated other comprehensive loss at December 31$(71.9)$(81.4)
Schedule of Future Pension Benefit Payments
Estimated future benefit payments to be funded by the Company are expected to be as follows:
Future Benefit Payments
2023$4.2 
20243.9 
20253.7 
20263.6 
20273.5 
2028-203214.7