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Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Other Liabilities Disclosure [Abstract]    
Reserve for uncertain tax positions $ 16.9 $ 16.5
Deferred income 18.4 15.7
Employee benefits 8.7 8.4
Insurance claims and expenses 9.4 9.1
Deferred payment obligation 9.4 9.3
Accrued development costs 7.5 6.1
Other 9.0 8.5
Total $ 79.3 $ 73.6