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Employee Benefits - Benefit Obligations and Funded Status of Pension Plans, OPEB and Salaried VEBAs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Salaried VEBA |  |  |
Change in benefit obligation: |  |  |
Obligation at beginning of year | $ 58.9 | $ 79.8 |
Service cost |  | 0.1 |
Interest cost | 2.9 | 1.9 |
Prior service cost (credit) | (8.8) |  |
Actuarial loss (gain) | 0.4 | (16.3) |
Benefits paid | (6.5) | (6.6) |
Obligation at end of year | 46.9 | 58.9 | $ 79.8
Change in plan assets: |  |  |
Fair market value of plan assets at beginning of year | 42.4 | 59.2 |
Actual return on assets | 6.1 | (10.2) |
Company contributions | 1.1 |  |
Benefits paid | (6.5) | (6.6) |
Fair market value of plan assets at end of year | 43.1 | 42.4 | 59.2
Net funded status | (3.8) | (16.5) |
Cumulative gain (loss) recognized in Accumulated other comprehensive income: |  |  |
Accumulated net actuarial gain | 5.2 | 1.7 |
Prior service cost | (16.0) | (29.7) |
Total | (10.8) | (28.0) |
Pension Plans |  |  |
Change in benefit obligation: |  |  |
Obligation at beginning of year | 18.8 | 20.3 |
Foreign currency translation adjustment | 0.2 | (0.5) |
Service cost | 3.8 | 5.8 | 4.1
Interest cost | 1.3 | 0.6 | 0.5
Prior service cost (credit) | 6.6 |  |
Actuarial loss (gain) | 0.2 | (7.1) |
Plan participants contributions | 0.1 | 0.1 |
Benefits paid | (0.5) | (0.4) |
Obligation at end of year | 30.5 | 18.8 | 20.3
Change in plan assets: |  |  |
Fair market value of plan assets at beginning of year | 14.9 | 9.8 |
Foreign currency translation adjustment | 0.2 | (0.5) |
Actual return on assets | 1.4 | (2.6) |
Plan participants contributions | 0.1 | 0.1 |
Company contributions | 4.4 | 8.5 |
Benefits paid | (0.5) | (0.4) |
Fair market value of plan assets at end of year | 20.5 | 14.9 | 9.8
Net funded status | (10.0) | (3.9) |
Cumulative gain (loss) recognized in Accumulated other comprehensive income: |  |  |
Accumulated net actuarial gain | 1.3 | 2.6 |
Prior service cost | (6.1) |  |
Total | (4.8) | 2.6 |
Other Postretirement Benefits Plan |  |  |
Change in benefit obligation: |  |  |
Obligation at beginning of year | 66.4 | 83.5 |
Service cost | 1.1 | 1.6 | 1.1
Interest cost | 3.4 | 2.2 | 1.7
Actuarial loss (gain) | (0.7) | (20.4) |
Plan participants contributions | 0.1 | 0.1 |
Benefits paid | (1.5) | (0.6) |
Obligation at end of year | 68.8 | 66.4 | $ 83.5
Change in plan assets: |  |  |
Plan participants contributions | 0.1 | 0.1 |
Company contributions | 1.4 | 0.5 |
Benefits paid | (1.5) | (0.6) |
Net funded status | (68.8) | (66.4) |
Cumulative gain (loss) recognized in Accumulated other comprehensive income: |  |  |
Accumulated net actuarial gain | 17.4 | 17.8 |
Total | $ 17.4 | $ 17.8 |

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