Inventories - Summary of Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 80.5	$ 56.5
Finished goods	37.5	42.7
Resale items	21.1	22.0
Other	3.2	3.4
Total	$ 142.3	$ 124.6