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Debt (Carrying Value of Debt) (Details) - USD ($)
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Feb. 29, 2020
Aug. 31, 2019
Debt Instrument [Line Items]          
Finance lease, liability $ 249,400,000        
Long-term debt, gross and lease obligation 9,678,300,000   $ 9,054,600,000    
Adjustments (123,900,000)   (120,400,000)    
Total long term debt maturities 9,678,300,000        
Total Debt 9,554,400,000   8,934,200,000    
Less: current portion (8,200,000)   (168,100,000)    
Long-term portion 9,546,200,000   8,766,100,000    
Credit facilities: Uncommitted facility          
Debt Instrument [Line Items]          
Credit facility maximum borrowing capacity 135,000,000        
Principal 0   0    
Adjustments 0   0    
Total long term debt maturities 0   0    
Credit facilities: June 2023          
Debt Instrument [Line Items]          
Principal 0   186,000,000.0    
Adjustments 0   0    
Total long term debt maturities 0   186,000,000.0    
Credit facilities: June 2023 | Line of Credit          
Debt Instrument [Line Items]          
Credit facility maximum borrowing capacity $ 2,250,000,000        
Senior notes: May 2023          
Debt Instrument [Line Items]          
Interest Rate 4.75%        
Principal $ 300,000,000.0   300,000,000.0    
Adjustments (100,000)   4,800,000    
Total long term debt maturities $ 299,900,000   304,800,000    
Senior notes: August 2024          
Debt Instrument [Line Items]          
Interest Rate 2.50%       2.50%
Principal $ 900,000,000.0   900,000,000.0    
Adjustments (4,800,000)   (6,600,000)    
Total long term debt maturities $ 895,200,000   893,400,000    
Senior notes: March 2025          
Debt Instrument [Line Items]          
Interest Rate 3.20%        
Principal $ 500,000,000.0   500,000,000.0    
Adjustments (2,200,000)   (3,000,000.0)    
Total long term debt maturities $ 497,800,000   497,000,000.0    
Senior notes: November 2025          
Debt Instrument [Line Items]          
Interest Rate 0.875%        
Principal $ 350,000,000.0   350,000,000.0    
Adjustments (2,600,000)   (3,300,000)    
Total long term debt maturities $ 347,400,000   346,700,000    
Senior Notes $500.0 million 2.900% Due July 2026          
Debt Instrument [Line Items]          
Interest Rate 2.90%        
Principal $ 500,000,000.0   500,000,000.0    
Adjustments (2,800,000)   (3,300,000)    
Total long term debt maturities $ 497,200,000   496,700,000    
Senior Notes $650.0 Million 3.375% Due November 2027          
Debt Instrument [Line Items]          
Interest Rate 3.375%        
Principal $ 650,000,000.0   650,000,000.0    
Adjustments (3,800,000)   (4,500,000)    
Total long term debt maturities $ 646,200,000   645,500,000    
Senior notes: May 2028          
Debt Instrument [Line Items]          
Interest Rate 3.95%        
Principal $ 800,000,000.0   800,000,000.0    
Adjustments (12,400,000)   (14,200,000)    
Total long term debt maturities $ 787,600,000   785,800,000    
Senior notes: March 2030          
Debt Instrument [Line Items]          
Interest Rate 2.30%     2.30%  
Principal $ 600,000,000.0   600,000,000.0    
Adjustments (5,900,000)   (6,500,000)    
Total long term debt maturities $ 594,100,000   593,500,000    
Senior notes: February 2031          
Debt Instrument [Line Items]          
Interest Rate 1.45%        
Principal $ 650,000,000.0   650,000,000.0    
Adjustments (7,900,000)   (8,600,000)    
Total long term debt maturities $ 642,100,000   641,400,000    
Senior notes: February 2032          
Debt Instrument [Line Items]          
Interest Rate 1.75%        
Principal $ 750,000,000.0   750,000,000.0    
Adjustments (6,600,000)   (7,100,000)    
Total long term debt maturities $ 743,400,000   742,900,000    
Senior Notes 2.375% Due March 2033          
Debt Instrument [Line Items]          
Interest Rate 2.375%        
Principal $ 700,000,000.0   0    
Adjustments (7,600,000)   0    
Total long term debt maturities $ 692,400,000   0    
Senior notes: March 2035          
Debt Instrument [Line Items]          
Interest Rate 6.086%        
Principal $ 181,900,000   181,900,000    
Adjustments (12,800,000)   (13,400,000)    
Total long term debt maturities $ 169,100,000   168,500,000    
Senior notes: March 2040          
Debt Instrument [Line Items]          
Interest Rate 6.20%        
Principal $ 399,900,000   399,900,000    
Adjustments (3,600,000)   (3,600,000)    
Total long term debt maturities $ 396,300,000   396,300,000    
Senior notes: May 2041          
Debt Instrument [Line Items]          
Interest Rate 5.70%        
Principal $ 385,700,000   385,700,000    
Adjustments (5,000,000.0)   (5,100,000)    
Total long term debt maturities $ 380,700,000   380,600,000    
Senior notes: March 2050          
Debt Instrument [Line Items]          
Interest Rate 3.05%        
Principal $ 400,000,000.0   400,000,000.0    
Adjustments (7,100,000)   (7,300,000)    
Total long term debt maturities $ 392,900,000   392,700,000    
Debentures: May 2021          
Debt Instrument [Line Items]          
Interest Rate 9.25% 9.25%      
Principal $ 0 $ 35,300,000 35,300,000    
Adjustments 0   (100,000)    
Total long term debt maturities $ 0   35,200,000    
Debentures: September 2035          
Debt Instrument [Line Items]          
Interest Rate 7.40%        
Principal $ 148,000,000.0   148,100,000    
Adjustments (31,100,000)   (32,100,000)    
Total long term debt maturities 116,900,000   116,000,000.0    
Tax-exempt: 2023 - 2051          
Debt Instrument [Line Items]          
Principal 1,189,100,000   1,111,200,000    
Adjustments (7,600,000)   (6,500,000)    
Total long term debt maturities $ 1,181,500,000   1,104,700,000    
Tax-exempt: 2023 - 2051 | Minimum          
Debt Instrument [Line Items]          
Interest Rate 15.00%        
Tax-exempt: 2023 - 2051 | Maximum          
Debt Instrument [Line Items]          
Interest Rate 30.00%        
Line Of Credit Due August 2026          
Debt Instrument [Line Items]          
Principal $ 24,300,000   0    
Adjustments 0   0    
Total long term debt maturities 24,300,000   0    
Line Of Credit Due August 2026 | Line of Credit          
Debt Instrument [Line Items]          
Credit facility maximum borrowing capacity 3,000,000,000        
Finance Leases          
Debt Instrument [Line Items]          
Finance lease, liability $ 249,400,000   $ 206,500,000    
Finance Leases | Minimum          
Debt Instrument [Line Items]          
Interest Rate 80.60%        
Finance Leases | Maximum          
Debt Instrument [Line Items]          
Interest Rate 975.00%