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Retirement Plans and Other Postretirement Benefits - Components of Net Periodic Cost, Changes in Plan Assets and Benefit Obligations, and AOCI Impacts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan |  |  |
Service cost: |  |  |
Benefit accrual | $ 0.0 | $ 0.0 | $ 0.0
Other expenses | 0.7 | 0.6 | 0.7
Interest cost | 0.5 | 0.5 | 0.7
Expected return on plan assets | (0.8) | (0.9) | (1.0)
Settlement loss | 0.0 | 0.0 | 0.5
Amortization of: |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Actuarial loss | 0.3 | 0.4 | 0.3
Net periodic pension expense | 0.7 | 0.6 | 1.2
Changes in plan assets and benefit obligations included in other comprehensive income (loss): |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Net actuarial loss (gain) | 0.9 | (0.2) | 0.3
Amortization of: |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Actuarial loss | (0.3) | (0.4) | (0.8)
Total recognized in other comprehensive income (loss) | $ 0.6 | $ (0.6) | $ (0.5)
Weighted average assumptions used to determine expense: |  |  |
Discount rate | 2.57% | 2.08% | 3.10%
Expected return on plan assets | 4.80% | 4.74% | 4.80%
Weighted average assumptions used to determine benefit obligations as of December 31: |  |  |
Discount rate | 5.39% | 2.57% | 2.08%
Expected return on plan assets | 4.80% | 4.74% | 4.80%
Supplemental Defined Benefit Plans |  |  |
Service cost: |  |  |
Benefit accrual | $ 0.0 | $ 0.0 | $ 0.0
Other expenses | 0.0 | 0.0 | 0.0
Interest cost | 0.3 | 0.3 | 0.5
Expected return on plan assets | 0.0 | 0.0 | 0.0
Settlement loss | 0.0 | 0.0 | 0.0
Amortization of: |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Actuarial loss | 0.4 | 0.4 | 0.3
Net periodic pension expense | 0.7 | 0.7 | 0.8
Changes in plan assets and benefit obligations included in other comprehensive income (loss): |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Net actuarial loss (gain) | (2.1) | (0.2) | 1.3
Amortization of: |  |  |
Prior service cost | 0.0 | 0.0 | 0.0
Actuarial loss | (0.4) | (0.4) | (0.3)
Total recognized in other comprehensive income (loss) | $ (2.5) | $ (0.6) | $ 1.0
Weighted average assumptions used to determine expense: |  |  |
Discount rate | 2.57% | 2.08% | 3.10%
Weighted average assumptions used to determine benefit obligations as of December 31: |  |  |
Discount rate | 5.39% | 2.57% | 2.08%

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