Business Combinations, Dispositions and Related Transactions - Schedule of Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Current assets	$ 896.2	$ 1,048.6
Restricted cash	19.6	13.9
Property and equipment, net	665.7	733.6	$ 796.4
LIABILITIES
Current maturities of long-term debt	9.5	9.3
Payable to Contran	45.5	46.0
Long-term debt	951.0	919.7
Waste Management
ASSETS
Current assets	10.1	14.6
Operating permits	48.1	53.2
Restricted cash	16.2	11.0
Property and equipment, net	150.0	161.5
LIABILITIES
Current maturities of long-term debt	4.9	4.5
Payable to Contran	26.1	26.1
Long-term debt	71.4	76.4
Accrued noncurrent closure and post closure costs	$ 27.4	$ 25.7

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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