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Debt - Carrying Values of Debt Instruments (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Aug. 31, 2022
May 31, 2022
Jan. 31, 2022
Aug. 31, 2021
Mar. 06, 2020
Debt Instrument [Line Items]              
Long-term debt, gross and lease obligation $ 12,046,600,000 $ 11,902,200,000          
Adjustments (121,500,000) (116,700,000)          
Total Debt 11,925,100,000 11,785,500,000          
Less: current portion (932,300,000) (456,000,000.0)          
Long-term portion 10,992,800,000 11,329,500,000          
Credit facilities: Uncommitted Credit Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity         $ 200,000,000.0    
Principal 9,900,000 0          
Adjustments 0 0          
Carrying Value 9,900,000 0          
Credit facilities: August 2026              
Debt Instrument [Line Items]              
Principal 154,400,000 250,000,000.0          
Adjustments 0 0          
Carrying Value 154,400,000 250,000,000.0          
Credit facilities: August 2026 | Line of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity           $ 3,000,000,000  
Credit facilities: Term Loan              
Debt Instrument [Line Items]              
Interest Rate             0.832%
Principal 700,000,000.0 1,000,000,000          
Adjustments 0 0          
Carrying Value 700,000,000.0 1,000,000,000          
Credit facilities: Commercial Paper Facility              
Debt Instrument [Line Items]              
Maximum borrowing capacity     $ 1,000,000,000 $ 500,000,000      
Principal 523,000,000 1,000,000,000          
Adjustments (200,000) (1,800,000)          
Carrying Value $ 522,800,000 998,200,000          
Senior notes: May 2023              
Debt Instrument [Line Items]              
Interest Rate 4.75%            
Principal $ 0 300,000,000.0          
Adjustments 0 (2,500,000)          
Carrying Value $ 0 297,500,000          
Senior notes: August 2024              
Debt Instrument [Line Items]              
Interest Rate 2.50%            
Principal $ 900,000,000.0 900,000,000.0          
Adjustments (1,700,000) (3,000,000.0)          
Carrying Value $ 898,300,000 897,000,000.0          
Senior notes: March 2025              
Debt Instrument [Line Items]              
Interest Rate 3.20%            
Principal $ 500,000,000.0 500,000,000.0          
Adjustments (1,000,000.0) (1,600,000)          
Carrying Value $ 499,000,000.0 498,400,000          
Senior notes: November 2025              
Debt Instrument [Line Items]              
Interest Rate 0.875%            
Principal $ 350,000,000.0 350,000,000.0          
Adjustments (1,400,000) (1,900,000)          
Carrying Value $ 348,600,000 348,100,000          
Senior notes: July 2026              
Debt Instrument [Line Items]              
Interest Rate 2.90%            
Principal $ 500,000,000.0 500,000,000.0          
Adjustments (1,800,000) (2,200,000)          
Carrying Value $ 498,200,000 497,800,000          
Senior notes: November 2027              
Debt Instrument [Line Items]              
Interest Rate 3.375%            
Principal $ 650,000,000.0 650,000,000.0          
Adjustments (2,600,000) (3,100,000)          
Carrying Value $ 647,400,000 646,900,000          
Senior notes: May 2028              
Debt Instrument [Line Items]              
Interest Rate 3.95%            
Principal $ 800,000,000.0 800,000,000.0          
Adjustments (9,400,000) (10,700,000)          
Carrying Value $ 790,600,000 789,300,000          
Senior notes: April 2029              
Debt Instrument [Line Items]              
Interest Rate 4.875%            
Principal $ 400,000,000.0 0          
Adjustments (4,700,000) 0          
Carrying Value $ 395,300,000 0          
Senior notes: March 2030              
Debt Instrument [Line Items]              
Interest Rate 2.30%            
Principal $ 600,000,000.0 600,000,000.0          
Adjustments (4,700,000) (5,200,000)          
Carrying Value $ 595,300,000 594,800,000          
Senior notes: February 2031              
Debt Instrument [Line Items]              
Interest Rate 1.45%            
Principal $ 650,000,000.0 650,000,000.0          
Adjustments (6,500,000) (7,100,000)          
Carrying Value $ 643,500,000 642,900,000          
Senior notes: February 2032              
Debt Instrument [Line Items]              
Interest Rate 1.75%            
Principal $ 750,000,000.0 750,000,000.0          
Adjustments (5,600,000) (6,000,000.0)          
Carrying Value $ 744,400,000 744,000,000.0          
Senior notes: March 2033              
Debt Instrument [Line Items]              
Interest Rate 2.375%            
Principal $ 700,000,000.0 700,000,000.0          
Adjustments (6,700,000) (7,100,000)          
Carrying Value $ 693,300,000 692,900,000          
Senior notes: April 2034              
Debt Instrument [Line Items]              
Interest Rate 5.00%            
Principal $ 800,000,000 0          
Adjustments (10,900,000) 0          
Carrying Value $ 789,100,000 0          
Senior notes: March 2035              
Debt Instrument [Line Items]              
Interest Rate 6.086%            
Principal $ 181,900,000 181,900,000          
Adjustments (11,700,000) (12,200,000)          
Carrying Value $ 170,200,000 169,700,000          
Senior notes: March 2040              
Debt Instrument [Line Items]              
Interest Rate 6.20%            
Principal $ 399,900,000 399,900,000          
Adjustments (3,300,000) (3,400,000)          
Carrying Value $ 396,600,000 396,500,000          
Senior notes: May 2041              
Debt Instrument [Line Items]              
Interest Rate 5.70%            
Principal $ 385,700,000 385,700,000          
Adjustments (4,800,000) (4,800,000)          
Carrying Value $ 380,900,000 380,900,000          
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) (7,000,000.0)          
Carrying Value $ 393,200,000 393,000,000.0          
Debentures: September 2035              
Debt Instrument [Line Items]              
Interest Rate 7.40%            
Principal $ 148,100,000 148,100,000          
Adjustments (29,100,000) (30,000,000.0)          
Carrying Value 119,000,000.0 118,100,000          
Tax-exempt              
Debt Instrument [Line Items]              
Principal 1,289,100,000 1,189,100,000          
Adjustments (8,600,000) (7,100,000)          
Carrying Value $ 1,280,500,000 1,182,000,000          
Tax-exempt | Minimum              
Debt Instrument [Line Items]              
Interest Rate 3.625%            
Tax-exempt | Maximum              
Debt Instrument [Line Items]              
Interest Rate 4.375%            
Finance leases              
Debt Instrument [Line Items]              
Finance leases $ 254,600,000 $ 247,500,000          
Finance leases | Minimum              
Debt Instrument [Line Items]              
Interest Rate 0.806%            
Finance leases | Maximum              
Debt Instrument [Line Items]              
Interest Rate 9.75%