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Future Minimum Rental Commitments (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating Lease Obligations [Line Items]      
2017 $ 23.5    
2018 17.5    
2019 13.0    
2020 9.1    
2021 4.3    
Future years 4.6    
Total 72.0    
Rent expense for non-cancelable operating leases $ 27.5 $ 23.7 $ 26.5
Minimum [Member]      
Operating Lease Obligations [Line Items]      
Operating lease term, years 1 year    
Maximum [Member]      
Operating Lease Obligations [Line Items]      
Operating lease term, years 7 years