v3.26.1
Short-term Financing (Narrative) (Details) - USD ($)
$ in Millions
5 Months Ended 12 Months Ended
Jun. 01, 2026
Jan. 23, 2026
Jan. 22, 2026
May 31, 2025
May 31, 2026
Feb. 28, 2026
Jan. 31, 2025
Jan. 07, 2025
JP Morgan Chase Bank, N.A. [Member] | Interest Rate Swaption [Member]                
Financing [Line Items]                
Aggregate notional amount             $ 3,000.0  
Swaption contract assets, premium paid             $ 19.2  
2017 Credit Facility [Member]                
Financing [Line Items]                
Maximum borrowing capacity   $ 1,000.0 $ 750.0          
Term of unsecured line of credit facility     5 years          
Expiration date   Jan. 23, 2031 Sep. 17, 2026          
2019 Credit Facility [Member]                
Financing [Line Items]                
Maximum borrowing capacity   $ 1,000.0            
Term of unsecured line of credit facility   5 years            
2020 PNC Credit Facility [Member]                
Financing [Line Items]                
Maximum borrowing capacity   $ 250.0            
Term of unsecured line of credit facility   3 years            
Revolving Credit Facility [Member]                
Financing [Line Items]                
Maximum borrowing capacity       $ 2,000.0 $ 2,000.0      
Outstanding loans       18.6        
Revolving Credit Facility [Member] | PNC Bank, National Association [Member]                
Financing [Line Items]                
Outstanding loans           $ 0.0    
Standby Letters of Credit [Member]                
Financing [Line Items]                
Maximum borrowing capacity       165.0 176.5      
Amounts outstanding       0.0 $ 0.0      
Standby Letters of Credit [Member] | Subsequent Event [Member]                
Financing [Line Items]                
Renewal term 1 year              
Bridge Loan Facility [Member] | JP Morgan Chase Bank, N.A. [Member]                
Financing [Line Items]                
Maximum borrowing capacity               $ 3,500.0
Debt financing fees, including structuring and commitment fees       $ 14.9        
Minimum [Member] | Revolving Credit Facility [Member]                
Financing [Line Items]                
Commitment fee, percentage         0.05%      
Minimum [Member] | Standby Letters of Credit [Member]                
Financing [Line Items]                
Expiration date         Jun. 01, 2026      
Maximum [Member] | Revolving Credit Facility [Member]                
Financing [Line Items]                
Commitment fee, percentage         0.15%      
Maximum [Member] | Standby Letters of Credit [Member]                
Financing [Line Items]                
Expiration date         May 26, 2027