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Defined Benefit Plans - Schedule of Retrospective Impact of Adopting ASU 2017-07 (Detail) - Accounting Standards Update 2017-07 [Member]
$ in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Increase/(decrease) to operating income $ (3.9)
Cost of products sold [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Increase/(decrease) to operating income 2.9
Selling, general and administrative Expenses [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Increase/(decrease) to operating income $ 1.0