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Pension and Other Postretirement Benefit Plans - Pension Plan Assets by Asset Category (Details) - Pension - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
U.S. |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | $ 348.5 | $ 444.2 | $ 418.2
U.S. | Fair value, Measurements, Recurring |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 348.5 | 444.2 |
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 285.9 | 381.8 |
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Equity funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 65.2 | 100.9 |
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Common stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 54.9 | 87.1 |
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 79.1 | 95.1 |
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 63.4 | 83.8 |
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Government obligations |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 9.7 | 5.2 |
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Preferred stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.2 | 1.2 |
U.S. | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 13.4 | 8.5 |
U.S. | Fair value, Measurements, Recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 174.0 | 233.9 |
U.S. | Fair value, Measurements, Recurring | Level 1 | Equity funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 52.1 | 80.0 |
U.S. | Fair value, Measurements, Recurring | Level 1 | Common stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 39.8 | 56.3 |
U.S. | Fair value, Measurements, Recurring | Level 1 | Fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 79.1 | 95.1 |
U.S. | Fair value, Measurements, Recurring | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 1 | Government obligations |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 1 | Preferred stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.2 | 0.4 |
U.S. | Fair value, Measurements, Recurring | Level 1 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 2.8 | 2.1 |
U.S. | Fair value, Measurements, Recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 111.9 | 147.9 |
U.S. | Fair value, Measurements, Recurring | Level 2 | Equity funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 13.1 | 20.9 |
U.S. | Fair value, Measurements, Recurring | Level 2 | Common stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 15.1 | 30.8 |
U.S. | Fair value, Measurements, Recurring | Level 2 | Fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 63.4 | 83.8 |
U.S. | Fair value, Measurements, Recurring | Level 2 | Government obligations |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 9.7 | 5.2 |
U.S. | Fair value, Measurements, Recurring | Level 2 | Preferred stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.8 |
U.S. | Fair value, Measurements, Recurring | Level 2 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 10.6 | 6.4 |
U.S. | Fair value, Measurements, Recurring | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 3 | Equity funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 3 | Common stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 3 | Fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 3 | Government obligations |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 3 | Preferred stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Level 3 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, Measurements, Recurring | Alternative investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 62.6 | 62.4 |
Foreign |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 307.0 | 392.5 | $ 383.0
Foreign | Fair value, Measurements, Recurring |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 307.0 | 392.5 |
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 273.9 | 363.6 |
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Equity funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 55.2 | 147.2 |
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Common stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 32.9 | 59.5 |
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 43.4 | 63.3 |
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 15.9 | 28.8 |
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Government obligations |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 113.2 | 51.8 |
Foreign | Fair value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 13.3 | 13.0 |
Foreign | Fair value, Measurements, Recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 36.1 | 67.4 |
Foreign | Fair value, Measurements, Recurring | Level 1 | Equity funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 1 | Common stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 32.9 | 59.5 |
Foreign | Fair value, Measurements, Recurring | Level 1 | Fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 1 | Government obligations |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 1 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 3.2 | 7.9 |
Foreign | Fair value, Measurements, Recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 237.8 | 296.2 |
Foreign | Fair value, Measurements, Recurring | Level 2 | Equity funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 55.2 | 147.2 |
Foreign | Fair value, Measurements, Recurring | Level 2 | Common stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 2 | Fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 43.4 | 63.3 |
Foreign | Fair value, Measurements, Recurring | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 15.9 | 28.8 |
Foreign | Fair value, Measurements, Recurring | Level 2 | Government obligations |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 113.2 | 51.8 |
Foreign | Fair value, Measurements, Recurring | Level 2 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 10.1 | 5.1 |
Foreign | Fair value, Measurements, Recurring | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 3 | Equity funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 3 | Common stock |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 3 | Fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 3 | Government obligations |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Level 3 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, Measurements, Recurring | Alternative investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Assets at fair value | $ 33.1 | $ 28.9 |

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