Business Combinations, Dispositions and Related Transactions - Schedule of Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
ASSETS
Current assets	$ 837.4	$ 896.2
Waste disposal site operating permits, net	42.9	48.1
Restricted cash	24.2	19.6
Property and equipment, net	654.5	665.7	$ 733.6
LIABILITIES
Current maturities of long-term debt	7.8	9.5
Long-term debt	957.2	951.0
Waste Management
ASSETS
Current assets	17.2	10.1
Restricted cash	21.6	16.2
Property and equipment, net	138.5	150.0
LIABILITIES
Current maturities of long-term debt	3.3	4.9
Long-term debt	68.0	71.4
Accrued noncurrent closure and post closure costs	29.4	27.4
Waste Management \| Capitalized Operating Permits
ASSETS
Waste disposal site operating permits, net	42.9	48.1
Waste Management \| Contran \| Trade Accounts Payables
LIABILITIES
Payable to affiliates	$ 31.4	$ 26.1

The estimated amount of costs required as of the balance sheet date to comply with regulatory requirements pertaining to the retirement of a waste management facility, which will be paid after one year or beyond the normal operating cycle, if longer.

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