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Pension and Other Postretirement Benefit Plans - Pension Plan Assets by Asset Category (Detail) - Pension - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | $ 438.2 | $ 412.6 | $ 522.1
United States | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value, excluding alternative investments | 387.9 | 359.5 |
Alternative investments | 50.3 | 53.1 |
Assets at fair value | 438.2 | 412.6 |
United States | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 149.6 | 137.7 |
United States | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 80.5 | 77.5 |
United States | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 101.6 | 86.5 |
United States | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 24.8 | 18.1 |
United States | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 23.5 | 29.9 |
United States | Fair value, measurements, recurring | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 1.5 | 1.4 |
United States | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 6.4 | 8.4 |
United States | Level 1 | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 308.7 | 277.1 |
United States | Level 1 | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 149.6 | 137.7 |
United States | Level 1 | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 54.9 | 51.1 |
United States | Level 1 | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 101.6 | 86.5 |
United States | Level 1 | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 1 | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 1 | Fair value, measurements, recurring | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 1.0 | 0.9 |
United States | Level 1 | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 1.6 | 0.9 |
United States | Level 2 | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 79.2 | 82.4 |
United States | Level 2 | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 2 | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 25.6 | 26.4 |
United States | Level 2 | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 2 | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 24.8 | 18.1 |
United States | Level 2 | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 23.5 | 29.9 |
United States | Level 2 | Fair value, measurements, recurring | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.5 | 0.5 |
United States | Level 2 | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 4.8 | 7.5 |
United States | Level 3 | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 3 | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 3 | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 3 | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 3 | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 3 | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 3 | Fair value, measurements, recurring | Preferred stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
United States | Level 3 | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 406.4 | 367.1 | $ 368.2
Foreign | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value, excluding alternative investments | 370.6 | 333.9 |
Alternative investments | 35.8 | 33.2 |
Assets at fair value | 406.4 | 367.1 |
Foreign | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 163.3 | 132.6 |
Foreign | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 71.6 | 73.2 |
Foreign | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 30.9 | 31.2 |
Foreign | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 37.0 | 37.1 |
Foreign | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 58.8 | 53.8 |
Foreign | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 9.0 | 6.0 |
Foreign | Level 1 | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 75.0 | 76.4 |
Foreign | Level 1 | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 1 | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 71.6 | 73.2 |
Foreign | Level 1 | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 1 | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 1 | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 1 | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 3.4 | 3.2 |
Foreign | Level 2 | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 295.6 | 257.5 |
Foreign | Level 2 | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 163.3 | 132.6 |
Foreign | Level 2 | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 2 | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 30.9 | 31.2 |
Foreign | Level 2 | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 37.0 | 37.1 |
Foreign | Level 2 | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 58.8 | 53.8 |
Foreign | Level 2 | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 5.6 | 2.8 |
Foreign | Level 3 | Fair value, measurements, recurring |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 3 | Fair value, measurements, recurring | Mutual funds/Equity funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 3 | Fair value, measurements, recurring | Common stock |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 3 | Fair value, measurements, recurring | Mutual funds/Fixed income funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 3 | Fair value, measurements, recurring | Corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 3 | Fair value, measurements, recurring | Government obligations |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | 0.0 | 0.0 |
Foreign | Level 3 | Fair value, measurements, recurring | Cash and short-term investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Assets at fair value | $ 0.0 | $ 0.0 |

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