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Employee Benefit Plans - Fair Values of Pension Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Employee benefit plans |  |
Fair value of plan assets | $ 255.8 | $ 295.5
Fixed income common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 179.2 | 180.3
U.S. Government securities |  |
Employee benefit plans |  |
Fair value of plan assets | 13.1 | 34.4
Global equity common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 35.2 | 36.4
Commingled global fund allocation |  |
Employee benefit plans |  |
Fair value of plan assets | 16.8 | 26.1
Short-term investments |  |
Employee benefit plans |  |
Fair value of plan assets | 10.6 | 17.4
Other |  |
Employee benefit plans |  |
Fair value of plan assets | 0.9 | 0.9
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Employee benefit plans |  |
Fair value of plan assets | 4.3 | 14.7
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government securities |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Global equity common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commingled global fund allocation |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments |  |
Employee benefit plans |  |
Fair value of plan assets | 4.3 | 14.7
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Significant Observable Inputs (Level 2) |  |
Employee benefit plans |  |
Fair value of plan assets | 250.6 | 279.9
Significant Observable Inputs (Level 2) | Fixed income common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 179.2 | 180.3
Significant Observable Inputs (Level 2) | U.S. Government securities |  |
Employee benefit plans |  |
Fair value of plan assets | 13.1 | 34.4
Significant Observable Inputs (Level 2) | Global equity common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 35.2 | 36.4
Significant Observable Inputs (Level 2) | Commingled global fund allocation |  |
Employee benefit plans |  |
Fair value of plan assets | 16.8 | 26.1
Significant Observable Inputs (Level 2) | Short-term investments |  |
Employee benefit plans |  |
Fair value of plan assets | 6.3 | 2.7
Significant Observable Inputs (Level 2) | Other |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) |  |
Employee benefit plans |  |
Fair value of plan assets | 0.9 | 0.9
Significant Unobservable Inputs (Level 3) | Fixed income common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | U.S. Government securities |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Global equity common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Commingled global fund allocation |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Short-term investments |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Other |  |
Employee benefit plans |  |
Fair value of plan assets | $ 0.9 | $ 0.9

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