XML 40 R50.htm IDEA: XBRL DOCUMENT v3.20.1
Debt - Carrying Values of Debt Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Feb. 29, 2020
Dec. 31, 2019
Aug. 31, 2019
Dec. 31, 2013
Debt Instrument [Line Items]          
Finance leases $ 117.5   $ 119.3    
Long-term debt, gross and lease obligation 9,079.0   8,788.6    
Adjustments (102.3)   (100.1)    
Total Debt 8,976.7   8,688.5    
Less: current portion (24.5)   (929.9)    
Long-term portion 8,952.2   7,758.6    
Uncommitted Credit Facility          
Debt Instrument [Line Items]          
Principal 40.0   11.6    
Adjustments 0.0   0.0    
Carrying Value 40.0   11.6    
Credit facilities: June 2023          
Debt Instrument [Line Items]          
Principal 354.4   184.4    
Adjustments 0.0   0.0    
Carrying Value $ 354.4   184.4    
Senior notes: September 2019          
Debt Instrument [Line Items]          
Interest Rate       5.50%  
Senior notes: March 2020          
Debt Instrument [Line Items]          
Interest Rate 5.00%     5.00%  
Principal $ 0.0   850.0    
Adjustments 0.0   (0.1)    
Carrying Value $ 0.0   849.9    
Senior notes: November 2021          
Debt Instrument [Line Items]          
Interest Rate 5.25%        
Principal $ 600.0   600.0    
Adjustments (0.7)   (0.8)    
Carrying Value $ 599.3   599.2    
Senior notes: June 2022          
Debt Instrument [Line Items]          
Interest Rate 3.55%        
Principal $ 850.0   850.0    
Adjustments (2.4)   (2.6)    
Carrying Value $ 847.6   847.4    
Senior notes: May 2023          
Debt Instrument [Line Items]          
Interest Rate 4.75%       4.75%
Principal $ 550.0   550.0    
Adjustments 12.4   2.6    
Carrying Value $ 562.4   552.6    
Senior notes: August 2024          
Debt Instrument [Line Items]          
Interest Rate 2.50% 2.30%   2.50%  
Principal $ 900.0   900.0    
Adjustments (7.9)   (8.3)    
Carrying Value $ 892.1   891.7    
Senior notes: March 2025          
Debt Instrument [Line Items]          
Interest Rate 3.20%        
Principal $ 500.0   500.0    
Adjustments (3.4)   (3.6)    
Carrying Value $ 496.6   496.4    
Senior notes: July 2026          
Debt Instrument [Line Items]          
Interest Rate 2.90%        
Principal $ 500.0   500.0    
Adjustments (3.7)   (3.9)    
Carrying Value $ 496.3   496.1    
Senior notes: November 2027          
Debt Instrument [Line Items]          
Interest Rate 3.375%        
Principal $ 650.0   650.0    
Adjustments (5.0)   (5.2)    
Carrying Value $ 645.0   644.8    
Senior notes: May 2028          
Debt Instrument [Line Items]          
Interest Rate 3.95%        
Principal $ 800.0   800.0    
Adjustments (15.3)   (15.7)    
Carrying Value $ 784.7   784.3    
Senior notes: March 2030          
Debt Instrument [Line Items]          
Interest Rate 2.30% 2.30%      
Principal $ 600.0        
Adjustments (7.0)        
Carrying Value $ 593.0        
Senior notes: March 2035          
Debt Instrument [Line Items]          
Interest Rate 6.086%        
Principal $ 181.9   181.9    
Adjustments (13.8)   (13.9)    
Carrying Value $ 168.1   168.0    
Senior notes: March 2040          
Debt Instrument [Line Items]          
Interest Rate 6.20%        
Principal $ 399.9   399.9    
Adjustments (3.7)   (3.7)    
Carrying Value $ 396.2   396.2    
Senior notes: May 2041          
Debt Instrument [Line Items]          
Interest Rate 5.70%        
Principal $ 385.7   385.7    
Adjustments (5.2)   (5.3)    
Carrying Value $ 380.5   380.4    
Senior notes: March 2050          
Debt Instrument [Line Items]          
Interest Rate 3.05% 3.05%      
Principal $ 400.0        
Adjustments (7.4)        
Carrying Value $ 392.6        
Debentures: May 2021          
Debt Instrument [Line Items]          
Interest Rate 9.25%        
Principal $ 35.3   35.3    
Adjustments (0.3)   (0.4)    
Carrying Value $ 35.0   34.9    
Debentures: September 2035          
Debt Instrument [Line Items]          
Interest Rate 7.40%        
Principal $ 148.1   148.1    
Adjustments (32.8)   (33.0)    
Carrying Value 115.3   115.1    
Tax-exempt: 2020 - 2049          
Debt Instrument [Line Items]          
Principal 1,066.2   1,122.4    
Adjustments (6.1)   (6.2)    
Carrying Value $ 1,060.1   $ 1,116.2    
Tax-exempt: 2020 - 2049 | Minimum          
Debt Instrument [Line Items]          
Interest Rate 0.96%        
Tax-exempt: 2020 - 2049 | Maximum          
Debt Instrument [Line Items]          
Interest Rate 2.50%        
Finance leases: 2019-2046 | Minimum          
Debt Instrument [Line Items]          
Interest Rate 1.917%        
Finance leases: 2019-2046 | Maximum          
Debt Instrument [Line Items]          
Interest Rate 12.203%