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Quarterly Financial Data - Additional Information (Detail) - Tradenames [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information [Line Items] |  |  |  |  |  |
Pre-tax defined benefit plan actuarial gains (losses) | $ (0.8) | $ 1.3 | $ (1.0) | $ (0.9) | $ 0.5 | $ (1.9)
After-tax defined benefit plan actuarial gains (losses) | $ (0.5) | $ 0.9 | $ (0.7) | $ (0.6) |  |

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- Definition Defined Benefit Plan, Actuarial Gain (Loss) Before Tax + References No definition available. + Details
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- Details
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