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Business Disposition - Schedule of Condensed Consolidated Balance Sheets (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
ASSETS    
Current assets $ 892.4 $ 896.2
Restricted cash 22.9 19.6
Property and equipment, net 672.2 665.7
LIABILITIES    
Current maturities of long-term debt 26.9 9.5
Long-term debt 971.1 951.0
Contran | Trade Accounts Payables    
LIABILITIES    
Payable to affiliates 30.0 26.1
Waste Management    
ASSETS    
Current assets 13.9 10.1
Restricted cash 20.3 16.2
Property and equipment, net 141.5 150.0
LIABILITIES    
Current maturities of long-term debt 4.0 4.9
Long-term debt 68.9 71.4
Accrued noncurrent closure and post closure costs 29.0 27.4
Waste Management | Capitalized Operating Permits    
ASSETS    
Waste disposal site operating permits, net 44.2 48.1
Waste Management | Contran | Trade Accounts Payables    
LIABILITIES    
Payable to affiliates $ 30.0 $ 26.1