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Employee Benefit Plans - Fair Values of Pension Plan Assets (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 USD ($) $ / item | Dec. 31, 2021 USD ($)
Employee benefit plans |  |
Fair value of plan assets | $ 292.7 | $ 454.0
Fixed income common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 196.4 | 291.2
Non-U.S. Government securities |  |
Employee benefit plans |  |
Fair value of plan assets | 0.3 | 0.3
U.S. Government securities |  |
Employee benefit plans |  |
Fair value of plan assets | 13.9 | 25.8
Global equity common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 38.0 | 58.0
Commingled global fund allocation |  |
Employee benefit plans |  |
Fair value of plan assets | 37.2 | 67.4
Short-term investments |  |
Employee benefit plans |  |
Fair value of plan assets | $ 6.0 | 10.4
Value of short-term investments (in dollars per unit) | $ / item | 1.00 |
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 | 6.0 | 10.4
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) | Non-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) | 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 | 6.0 | 10.4
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 | 285.8 | 442.7
Significant Observable Inputs (Level 2) | Fixed income common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 196.4 | 291.2
Significant Observable Inputs (Level 2) | Non-U.S. Government securities |  |
Employee benefit plans |  |
Fair value of plan assets | 0.3 | 0.3
Significant Observable Inputs (Level 2) | U.S. Government securities |  |
Employee benefit plans |  |
Fair value of plan assets | 13.9 | 25.8
Significant Observable Inputs (Level 2) | Global equity common trust funds |  |
Employee benefit plans |  |
Fair value of plan assets | 38.0 | 58.0
Significant Observable Inputs (Level 2) | Commingled global fund allocation |  |
Employee benefit plans |  |
Fair value of plan assets | 37.2 | 67.4
Significant Observable Inputs (Level 2) | Short-term investments |  |
Employee benefit plans |  |
Fair value of plan assets | 0.0 | 0.0
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) | Non-U.S. Government securities |  |
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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