Debt, Derivatives and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025	May 31, 2025
Debt Instrument [Line Items]
Long-term debt, carrying amount	$ 2,436,600,000		$ 2,436,600,000		$ 2,436,600,000
Debt, fair value	2,459,400,000		2,459,400,000		2,404,700,000
Notional value	500,000,000.0		500,000,000.0		500,000,000.0
Commercial paper
Debt Instrument [Line Items]
Debt due within one year	229,490,000		$ 229,490,000		0
Interest rate			3.81%
Debt due within one year					0
Accumulated Other Comprehensive Income
Debt Instrument [Line Items]
Amortization of interest rate lock agreements - decrease to other comprehensive income	1,500,000	$ 1,500,000	$ 4,600,000	$ 4,600,000
Revolving credit facility
Debt Instrument [Line Items]
Revolving credit facility amount outstanding	0		0		$ 0
Revolving credit facility | Commercial paper
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity with accordion feature	2,000,000,000.0		2,000,000,000.0
Debt amendment, increase limit (up to)	1,000,000,000.0		1,000,000,000.0
Letter of Credit | Commercial paper
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity with accordion feature	300,000,000.0		300,000,000.0
Bridge Loan | Commercial paper
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity with accordion feature	$ 150,000,000.0		$ 150,000,000.0