Other Noncurrent Assets - Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Other noncurrent assets:
Land held for development	$ 131.1	$ 138.1
Restricted cash	34.8	24.2
IBNR receivables	7.2	7.1
Capital lease deposit	6.2	6.2
Pension asset	2.1	1.6
Other	15.5	17.9
Total	$ 196.9	238.0
Waste Management | Capitalized Operating Permits
Other noncurrent assets:
Waste disposal site operating permits, net		$ 42.9