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Debt - Carrying Values of Debt Instruments (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Oct. 31, 2023
Mar. 31, 2023
May 31, 2022
Jan. 31, 2022
Aug. 31, 2021
Mar. 06, 2020
Debt Instrument [Line Items]                
Long-term debt, gross and lease obligation $ 12,959,800,000 $ 12,949,100,000            
Adjustments (127,800,000) (129,700,000)            
Total Debt 12,832,000,000 12,819,400,000            
Less: current portion (1,431,900,000) (932,300,000)            
Long-term portion 11,400,100,000 11,887,100,000            
Credit facilities: Uncommitted Credit Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity           $ 200,000,000.0    
Principal 24,200,000 0            
Adjustments 0 0            
Carrying Value 24,200,000 0            
Credit facilities: August 2026                
Debt Instrument [Line Items]                
Principal 162,900,000 297,100,000            
Adjustments 0 0            
Carrying Value 162,900,000 297,100,000            
Credit facilities: August 2026 | Line of Credit                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 3,500,000,000       $ 3,000,000,000.0  
Credit facilities: Term Loan                
Debt Instrument [Line Items]                
Interest Rate               0.832%
Principal 500,000,000 500,000,000.0            
Adjustments 0 0            
Carrying Value 500,000,000.0 500,000,000.0            
Credit facilities: Commercial Paper Facility                
Debt Instrument [Line Items]                
Maximum borrowing capacity     $ 1,500,000,000   $ 500,000,000      
Principal 509,000,000.0 496,000,000.0            
Adjustments (700,000) (700,000)            
Carrying Value $ 508,300,000 495,300,000            
Senior notes: August 2024                
Debt Instrument [Line Items]                
Interest Rate 2.50%              
Principal $ 900,000,000.0 900,000,000.0            
Adjustments (700,000) (1,200,000)            
Carrying Value $ 899,300,000 898,800,000            
Senior notes: March 2025                
Debt Instrument [Line Items]                
Interest Rate 3.20%              
Principal $ 500,000,000.0 500,000,000.0            
Adjustments (700,000) (900,000)            
Carrying Value $ 499,300,000 499,100,000            
Senior notes: November 2025                
Debt Instrument [Line Items]                
Interest Rate 0.875%              
Principal $ 350,000,000.0 350,000,000.0            
Adjustments (1,100,000) (1,200,000)            
Carrying Value $ 348,900,000 348,800,000            
Senior notes: July 2026                
Debt Instrument [Line Items]                
Interest Rate 2.90%              
Principal $ 500,000,000.0 500,000,000.0            
Adjustments (1,500,000) (1,600,000)            
Carrying Value $ 498,500,000 498,400,000            
Senior notes: November 2027                
Debt Instrument [Line Items]                
Interest Rate 3.375%              
Principal $ 650,000,000.0 650,000,000.0            
Adjustments (2,300,000) (2,500,000)            
Carrying Value $ 647,700,000 647,500,000            
Senior notes: May 2028                
Debt Instrument [Line Items]                
Interest Rate 3.95%              
Principal $ 800,000,000.0 800,000,000.0            
Adjustments (8,400,000) (8,900,000)            
Carrying Value $ 791,600,000 $ 791,100,000            
Senior notes: April 2029                
Debt Instrument [Line Items]                
Interest Rate 4.875% 4.875%   4.875%        
Principal $ 750,000,000.0 $ 750,000,000.0            
Adjustments (6,900,000) (6,900,000)            
Carrying Value $ 743,100,000 743,100,000            
Senior notes: March 2030                
Debt Instrument [Line Items]                
Interest Rate 2.30%              
Principal $ 600,000,000.0 600,000,000.0            
Adjustments (4,400,000) (4,500,000)            
Carrying Value $ 595,600,000 595,500,000            
Senior notes: February 2031                
Debt Instrument [Line Items]                
Interest Rate 1.45%              
Principal $ 650,000,000.0 650,000,000.0            
Adjustments (6,000,000.0) (6,200,000)            
Carrying Value $ 644,000,000.0 643,800,000            
Senior notes: February 2032                
Debt Instrument [Line Items]                
Interest Rate 1.75%              
Principal $ 750,000,000.0 750,000,000.0            
Adjustments (5,200,000) (5,400,000)            
Carrying Value $ 744,800,000 744,600,000            
Senior notes: March 2033                
Debt Instrument [Line Items]                
Interest Rate 2.375%              
Principal $ 700,000,000.0 700,000,000.0            
Adjustments (6,300,000) (6,500,000)            
Carrying Value $ 693,700,000 $ 693,500,000            
Senior notes: December 2033                
Debt Instrument [Line Items]                
Interest Rate 5.00% 5.00%            
Principal $ 650,000,000.0 $ 650,000,000.0            
Adjustments (9,300,000) (8,900,000)            
Carrying Value $ 640,700,000 641,100,000            
Senior notes: April 2034                
Debt Instrument [Line Items]                
Interest Rate 5.00%     5.00%        
Principal $ 800,000,000.0 800,000,000.0   $ 800,000,000        
Adjustments (10,500,000) (10,700,000)            
Carrying Value $ 789,500,000 789,300,000            
Senior notes: March 2035                
Debt Instrument [Line Items]                
Interest Rate 6.086%              
Principal $ 181,900,000 181,900,000            
Adjustments (11,300,000) (11,500,000)            
Carrying Value $ 170,600,000 170,400,000            
Senior notes: March 2040                
Debt Instrument [Line Items]                
Interest Rate 6.20%              
Principal $ 399,900,000 399,900,000            
Adjustments (3,200,000) (3,300,000)            
Carrying Value $ 396,700,000 396,600,000            
Senior notes: May 2041                
Debt Instrument [Line Items]                
Interest Rate 5.70%              
Principal $ 385,700,000 385,700,000            
Adjustments (4,700,000) (4,700,000)            
Carrying Value $ 381,000,000.0 381,000,000.0            
Senior notes: March 2050                
Debt Instrument [Line Items]                
Interest Rate 3.05%              
Principal $ 400,000,000.0 400,000,000.0            
Adjustments (6,800,000) (6,800,000)            
Carrying Value $ 393,200,000 393,200,000            
Debentures: September 2035                
Debt Instrument [Line Items]                
Interest Rate 7.40%              
Principal $ 148,100,000 148,100,000            
Adjustments (28,500,000) (28,800,000)            
Carrying Value 119,600,000 119,300,000            
Tax-exempt                
Debt Instrument [Line Items]                
Principal 1,389,100,000 1,289,100,000            
Adjustments (9,300,000) (8,500,000)            
Carrying Value $ 1,379,800,000 1,280,600,000            
Tax-exempt | Minimum                
Debt Instrument [Line Items]                
Interest Rate 3.70%              
Tax-exempt | Maximum                
Debt Instrument [Line Items]                
Interest Rate 4.90%              
Finance leases                
Debt Instrument [Line Items]                
Finance leases $ 259,000,000.0 $ 251,300,000            
Finance leases | Minimum                
Debt Instrument [Line Items]                
Interest Rate 0.806%              
Finance leases | Maximum                
Debt Instrument [Line Items]                
Interest Rate 9.75%