XML 62 R50.htm IDEA: XBRL DOCUMENT v3.20.2
Debt - Carrying Values of Debt Instruments (Details) - USD ($)
Sep. 30, 2020
Aug. 31, 2020
Feb. 29, 2020
Dec. 31, 2019
Aug. 31, 2019
Dec. 31, 2018
Dec. 31, 2013
Debt Instrument [Line Items]              
Finance leases $ 210,100,000     $ 119,300,000      
Long-term debt, gross and lease obligation 8,887,200,000     8,788,600,000      
Adjustments (108,400,000)     (100,100,000)      
Total Debt 8,778,800,000     8,688,500,000      
Less: current portion (184,300,000)     (929,900,000)      
Long-term portion 8,594,500,000     7,758,600,000      
Revolving Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity 2,250,000,000         $ 2,250,000,000  
Credit Facilities: Uncommitted Credit Facility              
Debt Instrument [Line Items]              
Principal 0     11,600,000      
Adjustments 0     0      
Carrying Value 0     11,600,000      
Credit facilities: August 2021              
Debt Instrument [Line Items]              
Adjustments 0     0      
Short-term Debt 0     0      
Credit facilities: August 2021 | Revolving Credit Facility | Line of Credit              
Debt Instrument [Line Items]              
Maximum borrowing capacity 1,000,000,000.0 $ 1,000,000,000.0          
Credit facilities: June 2023              
Debt Instrument [Line Items]              
Principal 0     184,400,000      
Adjustments 0     0      
Carrying Value $ 0     184,400,000      
Senior notes: March 2020              
Debt Instrument [Line Items]              
Interest Rate 5.00%       5.00%    
Principal $ 0     850,000,000.0      
Adjustments 0     (100,000)      
Carrying Value $ 0     849,900,000      
Senior notes: November 2021              
Debt Instrument [Line Items]              
Interest Rate 5.25%            
Principal $ 0     600,000,000.0      
Adjustments 0     (800,000)      
Carrying Value $ 0     599,200,000      
Senior notes: June 2022              
Debt Instrument [Line Items]              
Interest Rate 3.55%            
Principal $ 850,000,000.0     850,000,000.0      
Adjustments (1,800,000)     (2,600,000)      
Carrying Value $ 848,200,000     847,400,000      
Senior notes: May 2023              
Debt Instrument [Line Items]              
Interest Rate 4.75%           4.75%
Principal $ 550,000,000.0     550,000,000.0      
Adjustments 10,500,000     2,600,000      
Carrying Value $ 560,500,000     552,600,000      
Senior notes: August 2024              
Debt Instrument [Line Items]              
Interest Rate 2.50%   2.30%   2.50%    
Principal $ 900,000,000.0     900,000,000.0      
Adjustments (7,000,000.0)     (8,300,000)      
Carrying Value $ 893,000,000.0     891,700,000      
Senior notes: March 2025              
Debt Instrument [Line Items]              
Interest Rate 3.20%            
Principal $ 500,000,000.0     500,000,000.0      
Adjustments (3,100,000)     (3,600,000)      
Carrying Value $ 496,900,000     496,400,000      
Senior notes: July 2026              
Debt Instrument [Line Items]              
Interest Rate 2.90%            
Principal $ 500,000,000.0     500,000,000.0      
Adjustments (3,500,000)     (3,900,000)      
Carrying Value $ 496,500,000     496,100,000      
Senior notes: November 2027              
Debt Instrument [Line Items]              
Interest Rate 3.375%            
Principal $ 650,000,000.0     650,000,000.0      
Adjustments (4,600,000)     (5,200,000)      
Carrying Value $ 645,400,000     644,800,000      
Senior notes: May 2028              
Debt Instrument [Line Items]              
Interest Rate 3.95%            
Principal $ 800,000,000.0     800,000,000.0      
Adjustments (14,500,000)     (15,700,000)      
Carrying Value $ 785,500,000     784,300,000      
Senior notes: March 2030              
Debt Instrument [Line Items]              
Interest Rate 2.30%   2.30%        
Principal $ 600,000,000.0     0      
Adjustments (6,700,000)     0      
Carrying Value $ 593,300,000     0      
Senior notes: February 2031              
Debt Instrument [Line Items]              
Interest Rate 1.45% 1.45%          
Principal $ 650,000,000.0     0      
Adjustments (8,900,000)     0      
Carrying Value $ 641,100,000     0      
Senior notes: March 2035              
Debt Instrument [Line Items]              
Interest Rate 6.086%            
Principal $ 181,900,000     181,900,000      
Adjustments (13,500,000)     (13,900,000)      
Carrying Value $ 168,400,000     168,000,000.0      
Senior notes: March 2040              
Debt Instrument [Line Items]              
Interest Rate 6.20%            
Principal $ 399,900,000     399,900,000      
Adjustments (3,700,000)     (3,700,000)      
Carrying Value $ 396,200,000     396,200,000      
Senior notes: May 2041              
Debt Instrument [Line Items]              
Interest Rate 5.70%            
Principal $ 385,700,000     385,700,000      
Adjustments (5,100,000)     (5,300,000)      
Carrying Value $ 380,600,000     380,400,000      
Senior notes: March 2050              
Debt Instrument [Line Items]              
Interest Rate 3.05%   3.05%        
Principal $ 400,000,000.0     0      
Adjustments (7,300,000)     0      
Carrying Value $ 392,700,000     0      
Debentures: May 2021              
Debt Instrument [Line Items]              
Interest Rate 9.25%            
Principal $ 35,300,000     35,300,000      
Adjustments (200,000)     (400,000)      
Carrying Value $ 35,100,000     34,900,000      
Debentures: September 2035              
Debt Instrument [Line Items]              
Interest Rate 7.40%            
Principal $ 148,100,000     148,100,000      
Adjustments (32,400,000)     (33,000,000.0)      
Carrying Value 115,700,000     115,100,000      
Tax-exempt: 2020 - 2049              
Debt Instrument [Line Items]              
Principal 1,126,200,000     1,122,400,000      
Adjustments (6,600,000)     (6,200,000)      
Carrying Value $ 1,119,600,000     $ 1,116,200,000      
Tax-exempt: 2020 - 2049 | Minimum              
Debt Instrument [Line Items]              
Interest Rate 0.25%            
Tax-exempt: 2020 - 2049 | Maximum              
Debt Instrument [Line Items]              
Interest Rate 0.875%            
Finance leases: 2019-2046 | Minimum              
Debt Instrument [Line Items]              
Interest Rate 1.882%            
Finance leases: 2019-2046 | Maximum              
Debt Instrument [Line Items]              
Interest Rate 12.203%