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Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Other Liabilities Disclosure [Abstract]    
Reserve for uncertain tax positions $ 31.3 $ 35.7
Asset retirement obligations 32.7 30.7
Deferred income 7.8 12.6
Employee benefits 8.3 7.6
Insurance claims and expenses 10.3 9.5
Deferred payment obligation 9.2 9.0
Other 10.8 8.8
Total $ 110.4 $ 113.9