Other Noncurrent Assets - Other Noncurrent Assets (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Other noncurrent assets:
Land held for development	$ 136.7	$ 138.1
Restricted cash	35.2	24.2
IBNR receivables	7.4	7.1
Capital lease deposit	6.2	6.2
Pension asset	1.7	1.6
Other	16.7	17.9
Total	246.3	238.0
Waste Management
Other noncurrent assets:
Restricted cash	23.0	21.6
Waste Management | Capitalized Operating Permits
Other noncurrent assets:
Waste disposal site operating permits, net	$ 42.4	$ 42.9