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Defined Benefit Plans - Schedule of Retrospective Impact of Adopting ASU 2017-07 (Detail) - Accounting Standards Update 2017-07 [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase/(decrease) to operating income $ (2.3) $ (9.4)
Cost of products sold [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase/(decrease) to operating income 1.7 6.8
Selling, general and administrative expenses [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Increase/(decrease) to operating income $ 0.6 $ 2.6