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Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 1,060.1 $ 932.5
Less accumulated depreciation and amortization 531.2 470.6
Net property, plant and equipment 528.9 461.9
Land    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 11.2 11.0
Building    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 329.9 286.4
Equipment    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 608.4 533.7
Software Development    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 110.6 $ 101.4