Debt, Derivatives and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023	May 31, 2023
Debt Instrument [Line Items]
Debt, carrying value	$ 2,486,600,000		$ 2,486,600,000		$ 2,500,000,000
Debt, fair value	2,410,800,000		2,410,800,000		2,443,800,000
Repayments of commercial paper				$ 62,200,000
Amortization of interest rate lock agreements - decrease to other comprehensive income (loss)	1,500,000	$ 1,500,000	4,500,000	$ 4,600,000
Notional value	500,000,000		500,000,000		500,000,000
Commercial paper
Debt Instrument [Line Items]
Commercial paper	0		0		0
Revolving credit facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity with accordion feature	2,000,000,000		2,000,000,000
Debt amendment, increase limit (up to)	500,000,000		500,000,000
Revolving credit facility amount outstanding	$ 0		0		$ 0
Senior Notes, 6.15%, 2037 Maturity | Senior notes
Debt Instrument [Line Items]
Repayment of debt			$ 13,500,000
Stated interest rate	6.15%		6.15%
Debt term			30 years
Loss recognized			$ 900,000