Debt, Derivatives and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Nov. 30, 2023	Nov. 30, 2022	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	2,396,500,000		2,396,500,000		2,443,800,000
Issuance of commercial paper			210,000,000	$ 124,000,000
Amortization of interest rate lock agreements - decrease to other comprehensive income (loss)	1,500,000	$ 1,500,000	2,900,000	$ 3,000,000
Notional value	500,000,000		500,000,000		500,000,000
Commercial paper
Debt Instrument [Line Items]
Commercial paper	$ 210,000,000		$ 210,000,000		0
Weighted average interest rate	5.52%		5.52%
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	$ 3,500,000		$ 13,500,000
Stated interest rate	6.15%		6.15%
Debt term	30 years
Loss recognized	$ 100,000		$ 900,000