Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Reserve for uncertain tax positions	$ 37.6	$ 35.7
Asset retirement obligations	32.0	30.7
Deferred income	11.5	12.6
Employee benefits	8.2	7.6
Insurance claims and expenses	10.0	9.5
Deferred payment obligation	9.2	9.0
Other	11.7	8.8
Total	$ 120.2	$ 113.9