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Acquisitions and Divestitures - Purchase Allocation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 30, 2020
Purchase price allocation
Property and equipment		$ 350.0	$ 115.0
Goodwill	$ 8,994.0	6,532.0	6,430.0
Other intangible assets		53.0	141.0
Allocation of consideration to goodwill		111.0
Acquired goodwill	2,470.0	108.0	$ 248.0
Carrying value of debt	13,810.0	$ 13,498.0
Advanced Disposal [Member]
Purchase price allocation
Accounts and other receivables				$ 159.0
Parts and supplies				8.0
Other current assets				17.0
Assets held for sale				1,022.0
Property and equipment				1,278.0
Goodwill	$ 2,500.0			2,470.0
Other intangible assets				604.0
Investments in unconsolidated entities				9.0
Other assets				27.0
Accounts payable				(107.0)
Accrued liabilities				(155.0)
Deferred revenues				(19.0)
Current portion of long-term debt				(12.0)
Liabilities held for sale				(234.0)
Long-term debt, less current portion				(441.0)
Landfill and environmental remediation liabilities				(242.0)
Deferred income taxes				(223.0)
Other liabilities				(79.0)
Total purchase price				4,082.0
Advanced Disposal [Member] | Advanced Disposal 5.625% senior notes due 2024 [Member]
Purchase price allocation
Carrying value of debt				$ 425.0
Interest rate (as a percent)				5.625%
Fair value of debt				$ 438.0

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