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Debt - Credit Facilities (Details) $ in Millions	1 Months Ended	6 Months Ended
Debt - Credit Facilities (Details) $ in Millions	Aug. 31, 2021 USD ($) extension	Jun. 30, 2024 USD ($)	Jun. 30, 2024 CAD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CAD ($)	Oct. 31, 2023 USD ($)	Feb. 28, 2023 USD ($)	Apr. 29, 2022 USD ($)	Jan. 31, 2022 USD ($)
Debt Instrument [Line Items]
Letters of credit utilizing availability under our credit facilities		$ 315,400,000		$ 336,500,000
Remaining borrowing capacity		2,821,900,000		2,371,200,000
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt		$ 182,700,000		297,100,000
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Number of available extensions \| extension	2
Extension period	1 year
Facility feature, increase limit	$ 1,000,000,000
Basis spread		0.91%
Term Loan Facility
Debt Instrument [Line Items]
Principal face amount of debt issued								$ 1,000,000,000
Uncommitted Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity									$ 200,000,000.0
Principal		$ 0		0
Long-term debt		0		0
Credit facilities: August 2026
Debt Instrument [Line Items]
Principal		182,700,000		297,100,000
Long-term debt		$ 182,700,000		297,100,000
Credit facilities: August 2026 \| Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 3,000,000,000.0					$ 3,500,000,000
Canadian Sublimit \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 1,000,000,000	$ 500,000,000
Long-term debt			$ 249.9		$ 201.5
Interest rate		6.223%	6.223%
Credit facilities: Commercial Paper Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,500,000,000
Principal		180,000,000.0		496,000,000.0
Long-term debt		$ 179,900,000		495,300,000
Weighted average interest rate		5.515%	5.515%
Credit facilities: Commercial Paper Facility \| Weighted Average
Debt Instrument [Line Items]
Debt instrument, term		24 days
Term Loan Facility
Debt Instrument [Line Items]
Principal		$ 0		500,000,000.0
Long-term debt		$ 0		$ 500,000,000.0