Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Other Liabilities Disclosure [Abstract]
Reserve for uncertain tax positions	$ 36.6	$ 35.7
Asset retirement obligations	31.4	30.7
Deferred income	11.9	12.6
Employee benefits	7.7	7.6
Insurance claims and expenses	9.7	9.5
Deferred payment obligation	9.1	9.0
Other	10.0	8.8
Total	$ 116.4	$ 113.9