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Weighted average interest rate of debt outstanding.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Debt (Credit Facilities) (Details) $ in Millions	1 Months Ended	12 Months Ended
Debt (Credit Facilities) (Details) $ in Millions	Aug. 31, 2021 USD ($) extension	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CAD ($)	Oct. 31, 2023 USD ($)	Feb. 28, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 31, 2022 USD ($)	May 31, 2022 USD ($)	Apr. 29, 2022 USD ($)	Jan. 31, 2022 USD ($)	Mar. 06, 2020
Line of Credit Facility [Line Items]
Write-off of deferred issuance costs		$ 200,000
Long-term debt		12,819,400,000
Letters of credit outstanding under Credit Facilities		336,500,000				$ 347,600,000
Balance availability under Credit Facilities		2,371,200,000				1,402,400,000
Credit facilities: Uncommitted facility
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity										$ 200,000,000.0
Long-term debt		0				0
Principal		0				0
Line Of Credit Due August 2026
Line of Credit Facility [Line Items]
Long-term debt		297,100,000				250,000,000.0
Principal		297,100,000				250,000,000.0
Term Loan Facility
Line of Credit Facility [Line Items]
Long-term debt		500,000,000.0				1,000,000,000
Interest rate											0.832%
Principal		500,000,000.0				1,000,000,000
Commercial Paper Facility
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity				$ 1,500,000,000			$ 1,000,000,000.0	$ 500,000,000
Long-term debt		495,300,000				998,200,000
Principal		$ 496,000,000				1,000,000,000
Weighted average interest rate		5.508%	5.508%
Commercial Paper Facility \| Weighted Average
Line of Credit Facility [Line Items]
Weighted average maturity term		18 days
Senior notes: April 2029
Line of Credit Facility [Line Items]
Long-term debt		$ 743,100,000				0
Interest rate		4.875%	4.875%
Principal		$ 750,000,000				0
Senior notes: April 2029 March Issuance
Line of Credit Facility [Line Items]
Principal		400,000,000
Senior notes: April 2029 December Issuance
Line of Credit Facility [Line Items]
Principal		350,000,000
Senior notes: April 2034
Line of Credit Facility [Line Items]
Long-term debt		$ 789,300,000				0
Interest rate		5.00%	5.00%
Principal		$ 800,000,000				0
Senior notes: December 2033
Line of Credit Facility [Line Items]
Long-term debt		$ 641,100,000				0
Interest rate		5.00%	5.00%
Principal		$ 650,000,000.0				0
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term debt		$ 297,100,000				$ 250,000,000
Revolving Credit Facility \| Canadian Sublimit
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity					$ 1,000,000,000.0
Long-term debt			$ 201.5
Interest rate		6.364%	6.364%
Line of Credit \| Line Of Credit Due August 2026
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	$ 3,000,000,000.0			$ 3,500,000,000
Line of Credit \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Number of available extensions \| extension	2
Extension period	1 year
Accordion feature, increase limit (up to)	$ 1,000,000,000.0
Basis spread on variable rate	0.91%
Term Loan Facility
Line of Credit Facility [Line Items]
Principal amount									$ 1,000,000,000.0
Term Loan Facility \| US Ecology
Line of Credit Facility [Line Items]
Weighted average interest rate		6.256%	6.256%