Debt, Derivatives and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2024	Nov. 30, 2023	May 31, 2024
Debt Instrument [Line Items]
Debt, carrying value	$ 2,486,600,000		$ 2,486,600,000		$ 2,486,600,000
Debt, fair value	2,450,300,000		2,450,300,000		2,392,800,000
Amortization of interest rate lock agreements - decrease to other comprehensive income	1,500,000	$ 1,500,000	3,000,000.0	$ 2,900,000
Notional value	500,000,000		500,000,000		500,000,000
Commercial paper
Debt Instrument [Line Items]
Debt due within one year	181,000,000	210,000,000.0	181,000,000	210,000,000.0	0
Commercial paper	$ 181,000,000.0		$ 181,000,000.0		0
Weighted average interest rate	4.70%		4.70%
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)	500,000,000.0		500,000,000.0
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%	6.15%	6.15%
Debt term				30 years
Loss recognized		$ 100,000		$ 900,000