Other Noncurrent Assets - Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Other noncurrent assets:
Land held for development	$ 127.1	$ 138.1
Restricted cash	37.0	24.2
IBNR receivables	7.2	7.1
Capital lease deposit	6.2	6.2
Pension asset	2.2	1.6
Other	14.6	17.9
Total	$ 194.3	238.0
Waste Management | Capitalized Operating Permits
Other noncurrent assets:
Waste disposal site operating permits, net		$ 42.9