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Pension and Other Postretirement Benefit Plans - Pension Plan Assets by Asset Category (Detail) - Pension - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | $ 376.6 | $ 330.6 | $ 438.2
U.S. | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 376.6 | 330.6 |
Assets at fair value, excluding alternative investments | 333.4 | 283.1 |
U.S. | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 103.6 | 89.1 |
U.S. | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 77.4 | 61.2 |
U.S. | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 76.0 | 78.6 |
U.S. | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 53.9 | 47.7 |
U.S. | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 7.3 | 1.0 |
U.S. | Fair value, measurements, recurring | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 1.2 | 1.3 |
U.S. | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 14.0 | 4.2 |
U.S. | Fair value, measurements, recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 212.0 | 187.6 |
U.S. | Fair value, measurements, recurring | Level 1 | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 81.5 | 74.4 |
U.S. | Fair value, measurements, recurring | Level 1 | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 45.5 | 33.6 |
U.S. | Fair value, measurements, recurring | Level 1 | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 76.0 | 78.6 |
U.S. | Fair value, measurements, recurring | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 1 | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 1 | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.6 | 0.8 |
U.S. | Fair value, measurements, recurring | Level 1 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 8.4 | 0.2 |
U.S. | Fair value, measurements, recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 121.4 | 95.5 |
U.S. | Fair value, measurements, recurring | Level 2 | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 22.1 | 14.7 |
U.S. | Fair value, measurements, recurring | Level 2 | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 31.9 | 27.6 |
U.S. | Fair value, measurements, recurring | Level 2 | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 53.9 | 47.7 |
U.S. | Fair value, measurements, recurring | Level 2 | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 7.3 | 1.0 |
U.S. | Fair value, measurements, recurring | Level 2 | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.6 | 0.5 |
U.S. | Fair value, measurements, recurring | Level 2 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 5.6 | 4.0 |
U.S. | Fair value, measurements, recurring | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 3 | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 3 | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 3 | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 3 | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 3 | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
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 [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
U.S. | Fair value, measurements, recurring | Alternative investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 43.2 | 47.5 |
Foreign |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 396.8 | 351.8 | $ 406.4
Foreign | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 396.8 | 351.8 |
Assets at fair value, excluding alternative investments | 358.9 | 317.7 |
Foreign | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 148.4 | 138.1 |
Foreign | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 66.7 | 58.3 |
Foreign | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 45.6 | 28.2 |
Foreign | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 31.5 | 32.9 |
Foreign | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 55.8 | 52.8 |
Foreign | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 10.9 | 7.4 |
Foreign | Fair value, measurements, recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 74.4 | 62.3 |
Foreign | Fair value, measurements, recurring | Level 1 | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 1 | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 66.7 | 58.3 |
Foreign | Fair value, measurements, recurring | Level 1 | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 1 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 1 | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 1 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 7.7 | 4.0 |
Foreign | Fair value, measurements, recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 284.5 | 255.4 |
Foreign | Fair value, measurements, recurring | Level 2 | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 148.4 | 138.1 |
Foreign | Fair value, measurements, recurring | Level 2 | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 2 | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 45.6 | 28.2 |
Foreign | Fair value, measurements, recurring | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 31.5 | 32.9 |
Foreign | Fair value, measurements, recurring | Level 2 | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 55.8 | 52.8 |
Foreign | Fair value, measurements, recurring | Level 2 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 3.2 | 3.4 |
Foreign | Fair value, measurements, recurring | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 3 | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 3 | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 3 | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 3 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 3 | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Level 3 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Fair value, measurements, recurring | Alternative investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | $ 37.9 | $ 34.1 |

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