v3.26.1
Fair Value Measurements (Schedule of Amortized Cost and Fair Value of Borrowings) (Details) - USD ($)
$ in Millions
May 31, 2026
May 31, 2025
Debt Instrument [Line Items]    
Long-term borrowings, Amortized cost $ 4,556.1 $ 4,948.2
Long-term borrowings, Fair value 4,600.8 5,005.7
Senior Notes, Series A [Member]    
Debt Instrument [Line Items]    
Long-term borrowings, Amortized cost   399.8
Long-term borrowings, Fair value   398.3
Senior Notes, Series B [Member]    
Debt Instrument [Line Items]    
Long-term borrowings, Amortized cost 399.5 399.3
Long-term borrowings, Fair value 397.4 395.5
5-Year Fixed Rate Bonds [Member]    
Debt Instrument [Line Items]    
Long-term borrowings, Amortized cost 1,487.9 1,484.8
Long-term borrowings, Fair value 1,504.9 1,505.1
7-Year Fixed Rate Bonds [Member]    
Debt Instrument [Line Items]    
Long-term borrowings, Amortized cost 1,485.2 1,482.7
Long-term borrowings, Fair value 1,504.3 1,504.9
10-Year Fixed Rate Bonds [Member]    
Debt Instrument [Line Items]    
Long-term borrowings, Amortized cost 1,183.5 1,181.6
Long-term borrowings, Fair value $ 1,194.2 $ 1,201.9