Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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Infrastructure development cost reimbursed.

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Quarterly Results of Operations - Schedule of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Litigation settlement expense, net						$ 19.3		$ 19.3	$ 62.0
Infrastructure reimbursement			$ 19.1			8.8	$ 19.7	9.2	4.3
Insurance recoveries						$ 7.7	1.6	7.7	1.3
Gain on land sales		$ 4.0			$ 4.4		4.5	4.4	12.5
Gain on sale of insurance and risk management business				$ 3.0			$ 4.9	$ 3.0	58.4
Waste Management
Pre-tax gain from disposal of discontinued operations	$ 4.9								$ 58.4