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Defined Benefit Plans - Accumulated Benefit Obligation (Detail) - Accounting Standards Update 2017-07 [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |
Decrease to operating income | $ (9.6) | $ (14.1)
Cost of products sold [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Decrease to operating income | 7.5 | 8.5
Selling, general and administrative expenses [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Decrease to operating income | $ 2.1 | $ 5.6

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