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Pension and Other Postretirement Benefit Plans - Pension Plan Assets by Asset Category (Detail) - Pension - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
U.S. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | $ 330.6 | $ 438.2 | $ 412.6
U.S. | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 330.6 | 438.2 |
Assets at fair value, excluding alternative investments | 283.1 | 387.9 |
U.S. | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 89.1 | 149.6 |
U.S. | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 61.2 | 80.5 |
U.S. | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 78.6 | 101.6 |
U.S. | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 47.7 | 24.8 |
U.S. | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 1.0 | 23.5 |
U.S. | Fair value, measurements, recurring | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 1.3 | 1.5 |
U.S. | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 4.2 | 6.4 |
U.S. | Fair value, measurements, recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 187.6 | 308.7 |
U.S. | Fair value, measurements, recurring | Level 1 | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 74.4 | 149.6 |
U.S. | Fair value, measurements, recurring | Level 1 | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 33.6 | 54.9 |
U.S. | Fair value, measurements, recurring | Level 1 | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 78.6 | 101.6 |
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 | 0.8 | 1.0 |
U.S. | Fair value, measurements, recurring | Level 1 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.2 | 1.6 |
U.S. | Fair value, measurements, recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 95.5 | 79.2 |
U.S. | Fair value, measurements, recurring | Level 2 | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 14.7 | 0.0 |
U.S. | Fair value, measurements, recurring | Level 2 | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 27.6 | 25.6 |
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 | 47.7 | 24.8 |
U.S. | Fair value, measurements, recurring | Level 2 | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 1.0 | 23.5 |
U.S. | Fair value, measurements, recurring | Level 2 | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.5 | 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 | 4.0 | 4.8 |
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 | 47.5 | 50.3 |
Foreign |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 351.8 | 406.4 | $ 367.1
Foreign | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 351.8 | 406.4 |
Assets at fair value, excluding alternative investments | 317.7 | 370.6 |
Foreign | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 138.1 | 163.3 |
Foreign | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 58.3 | 71.6 |
Foreign | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 28.2 | 30.9 |
Foreign | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 32.9 | 37.0 |
Foreign | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 52.8 | 58.8 |
Foreign | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 7.4 | 9.0 |
Foreign | Fair value, measurements, recurring | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 62.3 | 75.0 |
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 | 58.3 | 71.6 |
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 | 4.0 | 3.4 |
Foreign | Fair value, measurements, recurring | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 255.4 | 295.6 |
Foreign | Fair value, measurements, recurring | Level 2 | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 138.1 | 163.3 |
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 | 28.2 | 30.9 |
Foreign | Fair value, measurements, recurring | Level 2 | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 32.9 | 37.0 |
Foreign | Fair value, measurements, recurring | Level 2 | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 52.8 | 58.8 |
Foreign | Fair value, measurements, recurring | Level 2 | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 3.4 | 5.6 |
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 | $ 34.1 | $ 35.8 |

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