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Retirement Plans - Fair Value of Pension Assets (Details) - Pensions - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | $ 23.1 | $ 31.8 | $ 31.2
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 23.1 | 31.8 |
Fair Value, Measurements, Recurring | Cash and short-term investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 0.2 | 0.2 |
Fair Value, Measurements, Recurring | Mutual funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 6.7 | 9.2 |
Fair Value, Measurements, Recurring | Pooled funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 14.5 | 20.3 |
Fair Value, Measurements, Recurring | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 1.7 | 2.1 |
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 6.9 | 9.4 |
Fair Value, Measurements, Recurring | Level 1 | Cash and short-term investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 0.2 | 0.2 |
Fair Value, Measurements, Recurring | Level 1 | Mutual funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 6.7 | 9.2 |
Fair Value, Measurements, Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 1.7 | 2.1 |
Fair Value, Measurements, Recurring | Level 2 | Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 1.7 | 2.1 |
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Investments Measured at Net Asset Value |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | 14.5 | 20.3 |
Fair Value, Measurements, Recurring | Investments Measured at Net Asset Value | Pooled funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Pension and other postretirement benefit asset | $ 14.5 | $ 20.3 |

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