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Debt - Credit Facilities (Details)
$ in Millions
1 Months Ended 9 Months Ended
Jul. 31, 2024
USD ($)
extension
Sep. 30, 2024
USD ($)
Sep. 30, 2024
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2023
CAD ($)
Apr. 29, 2022
USD ($)
Jan. 31, 2022
USD ($)
Debt Instrument [Line Items]              
Letters of credit utilizing availability under our credit facilities   $ 315,200,000   $ 336,500,000      
Remaining borrowing capacity   2,411,500,000   2,371,200,000      
Revolving Credit Facility              
Debt Instrument [Line Items]              
Long-term debt   $ 178,300,000   297,100,000      
Line of Credit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Number of available extensions | extension 2            
Extension period 1 year            
Facility feature, increase limit $ 1,000,000,000            
Basis spread   0.92%          
Term Loan Facility              
Debt Instrument [Line Items]              
Principal face amount of debt issued           $ 1,000,000,000  
Uncommitted Revolver              
Debt Instrument [Line Items]              
Maximum borrowing capacity             $ 200,000,000.0
Principal   $ 92,600,000   0      
Long-term debt   92,600,000   0      
Credit facilities: The Credit Facility              
Debt Instrument [Line Items]              
Principal   178,300,000   297,100,000      
Long-term debt   $ 178,300,000   297,100,000      
Credit facilities: The Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity 3,500,000,000            
Canadian Sublimit | Revolving Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity $ 1,000,000,000            
Long-term debt     $ 241.0   $ 201.5    
Interest rate   5.525% 5.525%        
Credit facilities: Commercial Paper Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity   $ 1,500,000,000          
Principal   595,000,000.0   496,000,000.0      
Long-term debt   $ 594,800,000   495,300,000      
Weighted average interest rate   4.91% 4.91%        
Credit facilities: Commercial Paper Facility | Weighted Average              
Debt Instrument [Line Items]              
Debt instrument, term   11 days          
Term Loan Facility              
Debt Instrument [Line Items]              
Principal   $ 0   500,000,000.0      
Long-term debt   $ 0   $ 500,000,000.0