Other Noncurrent Liabilities - Other Noncurrent Liabilities (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Other Noncurrent Liabilities [Line Items]
Reserve for uncertain tax positions	$ 28.7	$ 32.9
Asset retirement obligations	29.9	28.8
Deferred income	12.0	20.2
Employee benefits	7.2	7.1
Insurance claims and expenses	9.7	9.6
Deferred payment obligation	8.9	8.8
Other	6.5	7.0
Total, Other noncurrent liabilities	108.7	114.6
Interest Rate Swap
Other Noncurrent Liabilities [Line Items]
Hedging liabilities	$ 5.8	$ 0.2