Debt - Narrative (Details)		1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022 USD ($)	Aug. 31, 2021 USD ($) landfill	Nov. 30, 2020 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2023 USD ($)	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	$ 349,800,000			$ 349,800,000		$ 349,800,000			$ 341,900,000
Remaining borrowing capacity	1,633,100,000			1,633,100,000		1,633,100,000			2,633,800,000
Derivative assets	114,000,000.0			114,000,000.0		114,000,000.0			19,700,000
Interest rate swap locks				0	$ 1,200,000	2,100,000	$ 3,500,000
Unrealized gain				9,100,000	0	8,100,000	0
Restricted cash and marketable securities	121,700,000			121,700,000	155,600,000	121,700,000	155,600,000		139,000,000.0				$ 149,100,000
Present value of lease liabilities	273,900,000			273,900,000		273,900,000
2022 Interest Rate Swap
Debt Instrument [Line Items]
Derivative, notional amount	300,000,000			300,000,000		300,000,000
Interest rate derivative liability at fair value	1,500,000			1,500,000		1,500,000
Interest rate derivative assets at fair value									4,700,000
Gain (loss) on interest rate swaps				(1,000,000)	(1,000,000)	(6,200,000)	(3,300,000)
Freestanding Derviatives
Debt Instrument [Line Items]
Derivative liability	1,200,000			1,200,000		1,200,000
Derivative assets									3,900,000
Freestanding Derviatives | Interest Expense
Debt Instrument [Line Items]
Gain (loss) on change in fair value of free standing derivatives				(800,000)	(800,000)	(5,200,000)	(2,800,000)
Net swap settlements
Debt Instrument [Line Items]
Gain (loss) on interest rate swaps				400,000	2,000,000	3,700,000	5,900,000
Hedged Senior Notes
Debt Instrument [Line Items]
Gain (loss) on interest rate swaps				100,000	900,000	4,100,000	3,500,000
Interest rate swap locks
Debt Instrument [Line Items]
Accumulated other comprehensive income (loss)	(22,600,000)			(22,600,000)		(22,600,000)			(25,800,000)
Effective portion of interest rate locks						4,000,000.0
Interest rate swap locks | Interest Expense | Cash Flow Hedging
Debt Instrument [Line Items]
Interest rate swap locks				(1,100,000)	(1,200,000)	(3,200,000)	(3,500,000)
2022 Interest Rate Swap
Debt Instrument [Line Items]
Unrealized gain				9,100,000		8,100,000
2022 Interest Rate Swap | Interest Expense | Cash Flow Hedging
Debt Instrument [Line Items]
Interest rate swap locks				1,100,000	0	1,100,000	0
Extended Interest Rate Swaps
Debt Instrument [Line Items]
Terminated derivative, notional amount															$ 550,000,000.0	$ 375,000,000.0
Gain (loss) on change in fair value of free-standing derivative instruments				40,200,000	9,700,000	115,000,000.0	38,700,000
2019 Extended Interest Rate Swaps
Debt Instrument [Line Items]
Derivative liability									20,900,000
Derivative assets	11,400,000			11,400,000		11,400,000
2020 Extended Interest Rate Swaps
Debt Instrument [Line Items]
Derivative liability	29,000,000			29,000,000		29,000,000
Derivative assets	64,200,000			64,200,000		64,200,000
2019 Offsetting Interest Rate Swap
Debt Instrument [Line Items]
Derivative liability	19,100,000			19,100,000		19,100,000
Offsetting Interest Rate Swap
Debt Instrument [Line Items]
Derivative liability	86,100,000			86,100,000		86,100,000			800,000
Derivative assets									11,100,000
Gain (loss) on change in fair value of free-standing derivative instruments				(39,700,000)	$ (10,100,000)	(112,800,000)	$ (39,200,000)
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	17,100,000			17,100,000		17,100,000			24,300,000
Revolving Credit Facility | US Ecology
Debt Instrument [Line Items]
Principal face amount of debt issued										$ 3,000,000,000.0
Credit facilities: August 2026
Debt Instrument [Line Items]
Long-term debt	17,100,000			17,100,000		17,100,000			24,300,000
Principal	17,100,000			17,100,000		17,100,000			24,300,000
Credit facilities: Commercial Paper Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	500,000,000			500,000,000		500,000,000
Long-term debt	999,000,000			999,000,000		999,000,000			0
Principal	$ 1,000,000,000			$ 1,000,000,000		$ 1,000,000,000			0
Weighted average interest rate	3.134%			3.134%		3.134%
Credit facilities: Commercial Paper Facility | Weighted Average
Debt Instrument [Line Items]
Weighted average maturity term	28 days
Uncommitted Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity									135,000,000.0			$ 200,000,000.0
Long-term debt	$ 60,800,000			$ 60,800,000		$ 60,800,000			0
Principal	60,800,000			60,800,000		60,800,000			0
Term Loan Facility
Debt Instrument [Line Items]
Long-term debt									0
Principal	1,000,000,000			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	38,500,000			38,500,000		38,500,000
Unrealized gain				7,000,000
Term Loan Facility | 2022 Interest Rate Swap | Forecast
Debt Instrument [Line Items]
Unrealized gain								$ (2,000,000)
Term Loan Facility | 2022 Interest Rate Swap | US Ecology
Debt Instrument [Line Items]
Derivative, notional amount														$ 500,000,000
Senior notes: May 2023
Debt Instrument [Line Items]
Long-term debt	296,100,000			296,100,000		296,100,000			299,900,000
Principal	$ 300,000,000.0			$ 300,000,000.0		$ 300,000,000.0			300,000,000.0
Interest rate	4.75%			4.75%		4.75%
Extinguishment of debt, amount			$ 250,000,000.0
Senior notes: March 2030
Debt Instrument [Line Items]
Long-term debt	$ 594,600,000			$ 594,600,000		$ 594,600,000			594,100,000
Principal	$ 600,000,000.0			$ 600,000,000.0		$ 600,000,000.0			600,000,000.0
Interest rate	2.30%			2.30%		2.30%
Senior notes: August 2024
Debt Instrument [Line Items]
Long-term debt	$ 896,500,000			$ 896,500,000		$ 896,500,000			895,200,000
Principal	$ 900,000,000.0			$ 900,000,000.0		$ 900,000,000.0			900,000,000.0
Interest rate	2.50%			2.50%		2.50%
Tax-exempt: 2023 - 2051
Debt Instrument [Line Items]
Long-term debt	$ 1,181,900,000			$ 1,181,900,000		$ 1,181,900,000			1,181,500,000
Principal	$ 1,189,100,000			$ 1,189,100,000		1,189,100,000			1,189,100,000
Principal face amount of debt issued									205,000,000.0
Proceeds from issuance of tax-exempt bonds									12,400,000
Solid Waste Disposal Revenue Bonds
Debt Instrument [Line Items]
Principal face amount of debt issued									30,000,000.0
Cost incurred and subsequently reimbursed						$ 30,000,000.0			$ 17,200,000
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%
Line of Credit | Credit facilities: August 2026
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 3,000,000,000.0
Term Loan Facility | US Ecology
Debt Instrument [Line Items]
Long-term debt											$ 1,000,000,000
Weighted average interest rate											3.04%
Principal face amount of debt issued										$ 1,000,000,000.0