Debt - Narrative (Details)	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 31, 2021 USD ($) landfill	Nov. 30, 2020 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	May 02, 2022 USD ($)	Apr. 29, 2022 USD ($)	Jan. 31, 2022 USD ($)	Dec. 31, 2020 USD ($)	Mar. 06, 2020 USD ($)	Feb. 29, 2020 USD ($)	Aug. 31, 2019 USD ($)
Debt Instrument [Line Items]
Letters of credit utilizing availability under our credit facilities			$ 350,600,000		$ 350,600,000		$ 341,900,000
Remaining borrowing capacity			1,435,000,000		1,435,000,000		2,633,800,000
Derivative assets							(19,700,000)
Unrealized loss			1,100,000	$ 0	1,100,000	$ 0
Restricted cash and marketable securities			121,500,000	151,000,000.0	121,500,000	151,000,000.0	139,000,000				$ 149,100,000
Present value of lease liabilities			269,300,000		269,300,000
2022 Interest Rate Swap
Debt Instrument [Line Items]
Derivative, notional amount			300,000,000		300,000,000
Interest rate derivative liability at fair value			500,000		500,000
Interest rate derivative assets at fair value							4,700,000
Gain (loss) on interest rate swaps			1,900,000	1,000,000	5,200,000	2,400,000
Freestanding Derviatives
Debt Instrument [Line Items]
Derivative assets			400,000		400,000		(3,900,000)
Freestanding Derviatives | Interest Expense
Debt Instrument [Line Items]
Gain (loss) on change in fair value of free standing derivatives			1,600,000	800,000	4,300,000	2,000,000.0
Net swap settlements
Debt Instrument [Line Items]
Gain (loss) on interest rate swaps			1,400,000	2,000,000	3,200,000	3,900,000
Hedged Senior Notes
Debt Instrument [Line Items]
Gain (loss) on interest rate swaps			1,300,000	1,100,000	4,000,000	2,600,000
Interest Rate Swap Locks
Debt Instrument [Line Items]
Accumulated other comprehensive income (loss)			(23,600,000)		(23,600,000)		(25,800,000)
Effective portion of interest rate locks					4,200,000
Extended Interest Rate Swaps
Debt Instrument [Line Items]
Terminated derivative, notional amount													$ 550,000,000	$ 375,000,000
Gain (loss) on change in fair value of free-standing derivative instruments			21,700,000	18,200,000	74,800,000	28,900,000
2019 Extended Interest Rate Swaps
Debt Instrument [Line Items]
Derivative liability			400,000		400,000		20,900,000
2020 Extended Interest Rate Swaps
Debt Instrument [Line Items]
Derivative assets			(31,800,000)		(31,800,000)
Derivative liability							29,000,000
2019 Offsetting Interest Rate Swap
Debt Instrument [Line Items]
Derivative liability			9,600,000		9,600,000
Offsetting Interest Rate Swap
Debt Instrument [Line Items]
Derivative assets							(11,100,000)
Derivative liability			55,900,000		55,900,000		800,000
Gain (loss) on change in fair value of free-standing derivative instruments			21,300,000	$ (17,600,000)	(73,100,000)	$ 29,100,000
Credit facilities: August 2026
Debt Instrument [Line Items]
Long-term debt			714,400,000		714,400,000		24,300,000
Principal			714,400,000		714,400,000		24,300,000
Credit facilities: Commercial Paper Facility
Debt Instrument [Line Items]
Long-term debt			499,600,000		499,600,000		0
Principal			$ 500,000,000		$ 500,000,000		0
Weighted average interest rate			1.845%		1.845%
Credit facilities: Commercial Paper Facility | Weighted Average
Debt Instrument [Line Items]
Weighted average maturity term					24 days
Uncommitted Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity							135,000,000			$ 200,000,000
Long-term debt			$ 137,500,000		$ 137,500,000		0
Principal			137,500,000		137,500,000		0
Debentures: May 2021
Debt Instrument [Line Items]
Interest rate				9.25%		9.25%
Repayments of debt				$ 35,300,000
Senior notes: May 2023
Debt Instrument [Line Items]
Long-term debt			296,000,000.0		296,000,000.0		299,900,000
Principal			$ 300,000,000.0		$ 300,000,000.0		300,000,000.0
Interest rate			4.75%		4.75%
Extinguishment of debt, amount		$ 250,000,000
Term Loan Facility
Debt Instrument [Line Items]
Long-term debt			$ 1,000,000,000		$ 1,000,000,000		0
Principal			1,000,000,000		1,000,000,000		0
Interest rate												0.832%
Term Loan Facility | 2022 Interest Rate Swap
Debt Instrument [Line Items]
Derivative asset			27,700,000		27,700,000
Unrealized loss			1,100,000
Term Loan Facility | 2022 Interest Rate Swap | US Ecology
Debt Instrument [Line Items]
Derivative, notional amount												$ 500,000,000
Senior notes: March 2030
Debt Instrument [Line Items]
Long-term debt			594,400,000		594,400,000		594,100,000
Principal			$ 600,000,000.0		$ 600,000,000.0		600,000,000.0
Interest rate			2.30%		2.30%
Senior notes: August 2024
Debt Instrument [Line Items]
Long-term debt			$ 896,000,000.0		$ 896,000,000.0		895,200,000
Principal			$ 900,000,000.0		$ 900,000,000.0		900,000,000.0
Interest rate			2.50%		2.50%
Tax-exempt: 2023 - 2051
Debt Instrument [Line Items]
Long-term debt			$ 1,181,800,000		$ 1,181,800,000		1,181,500,000
Principal			1,189,100,000		1,189,100,000		1,189,100,000
Principal face amount of debt issued							205,000,000
Proceeds from issuance of tax-exempt bonds			2,000,000		2,000,000		12,400,000
Solid Waste Disposal Revenue Bonds
Debt Instrument [Line Items]
Principal face amount of debt issued							30,000,000
Cost incurred and subsequently reimbursed					27,700,000		17,200,000
Revolving Credit Facility
Debt Instrument [Line Items]
Borrowings			$ 714,400,000		$ 714,400,000		$ 24,300,000
Revolving Credit Facility | US Ecology
Debt Instrument [Line Items]
Principal face amount of debt issued								$ 3,000,000,000
Line of Credit | Credit facilities: August 2026
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 3,000,000,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Number of available extensions | landfill	2
Extension period	1 year
Facility feature, increase limit	$ 1,000,000,000
Basis spread					0.91%
Term Loan Facility | US Ecology
Debt Instrument [Line Items]
Principal face amount of debt issued								$ 1,000,000,000	$ 1,000,000,000