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Commitments and Contingencies - Summary of Net Asbestos Charges (Detail) - Asbestos Related Matters [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Asbestos Related Contingencies [Line Items] |  |  |
Asbestos provision | $ 56.5 | $ 59.0 |
Asbestos remeasurement, net | (76.4) | (81.8) |
Change in Defense Cost Estimate for Asbestos Matters | 0.0 | 4.9 |
Settlement Agreement | 0.0 | (2.1) |
Continuing Operations [Member] |  |  |
Asbestos Related Contingencies [Line Items] |  |  |
Asbestos provision | 56.5 | 59.0 | $ 63.0
Asbestos remeasurement, net | (76.4) | (81.8) | (44.8)
Change in Defense Cost Estimate for Asbestos Matters | 0.0 | (4.9) | (100.7)
Settlement Agreement | 0.0 | 2.1 | (8.9)
Net asbestos charge | $ (19.9) | $ (25.6) | $ (91.4)

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