v3.26.1
Debt and Credit Facilities (Narrative) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Total borrowings outstanding $ 2,040.8 $ 1,990.8
Line of credit facility, borrowing capacity $ 1,000.0  
Line of Credit    
Debt Instrument [Line Items]    
Interest rate 4.753%  
Investment, Basis Spread, Variable Rate 1.125%  
Line of Credit | Minimum    
Debt Instrument [Line Items]    
Variable rate 0.875%  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.08%  
Line of Credit | Maximum    
Debt Instrument [Line Items]    
Variable rate 1.375%  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.20%  
Line of Credit | Revolving Facility    
Debt Instrument [Line Items]    
Total borrowings outstanding $ 240.6 190.6
Line of Credit Facility, Capacity available for issuance of letters of credit 100.0  
Letters of credit outstanding amount 25.3  
Senior Notes | 3.550% Senior Note due 2027    
Debt Instrument [Line Items]    
Total borrowings outstanding $ 400.0 400.0
Stated interest rate 3.55%  
Senior Notes | 3.500% Senior Notes Due 2029    
Debt Instrument [Line Items]    
Total borrowings outstanding $ 400.0 400.0
Stated interest rate 3.50%  
Senior Notes | Five Point Four One One Percent Senior Notes Due 2032    
Debt Instrument [Line Items]    
Total borrowings outstanding $ 600.0 600.0
Stated interest rate 5.411%  
Senior Notes | Five Point Six Percent Senior Notes Due 2034    
Debt Instrument [Line Items]    
Total borrowings outstanding $ 400.0 $ 400.0
Stated interest rate 5.60%