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Debt (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Principal $ 7,748,500,000.0 $ 7,635,800,000.0
Adjustments (89,600,000) (102,900,000)
Capital Lease Obligations, Noncurrent 108,500,000 111,500,000
Total debt 7,658,900,000 7,532,900,000
Less: current portion (5,800,000) (5,500,000)
Long-term portion $ 7,653,100,000 7,527,400,000
Credit facilities: Uncommitted facility    
Debt Instrument [Line Items]    
Interest Rate Variable  
Principal $ 0 19,000,000.0
Adjustments 0 0
Carrying Value $ 0 19,000,000
Puerto Rico Uncommitted Facility    
Debt Instrument [Line Items]    
Interest Rate Variable  
Principal $ 0 0
Adjustments 0 0
Carrying Value $ 0 0
Credit facilities: June 2019    
Debt Instrument [Line Items]    
Interest Rate Variable  
Principal $ 140,000,000 0
Adjustments 0 0
Carrying Value $ 140,000,000 0
Credit facilities: May 2021    
Debt Instrument [Line Items]    
Interest Rate Variable  
Principal $ 70,000,000 0
Adjustments 0 0
Carrying Value $ 70,000,000 0
Senior notes: May 2018    
Debt Instrument [Line Items]    
Interest Rate 3.80%  
Principal $ 700,000,000 700,000,000
Adjustments (1,200,000) (2,000,000)
Carrying Value $ 698,800,000 698,000,000
Senior notes: September 2019    
Debt Instrument [Line Items]    
Interest Rate 5.50%  
Principal $ 650,000,000 650,000,000
Adjustments (3,300,000) (4,400,000)
Carrying Value $ 646,700,000 645,600,000
Senior notes: March 2020    
Debt Instrument [Line Items]    
Interest Rate 5.00%  
Principal $ 850,000,000 850,000,000
Adjustments (2,600,000) (3,400,000)
Carrying Value $ 847,400,000 846,600,000
Senior notes: November 2021    
Debt Instrument [Line Items]    
Interest Rate 5.25%  
Principal $ 600,000,000 600,000,000
Adjustments (1,900,000) (2,300,000)
Carrying Value $ 598,100,000 597,700,000
Senior notes: June 2022    
Debt Instrument [Line Items]    
Interest Rate 3.55%  
Principal $ 850,000,000 850,000,000
Adjustments (5,600,000) (6,500,000)
Carrying Value $ 844,400,000 843,500,000
Senior notes: May 2023    
Debt Instrument [Line Items]    
Interest Rate 4.75%  
Principal $ 550,000,000 550,000,000
Adjustments 3,500,000 9,400,000
Carrying Value $ 553,500,000 559,400,000
Senior notes: March 2025    
Debt Instrument [Line Items]    
Interest Rate 3.20%  
Principal $ 500,000,000 500,000,000
Adjustments (5,400,000) (6,000,000)
Carrying Value $ 494,600,000 494,000,000
Senior notes: June 2026    
Debt Instrument [Line Items]    
Interest Rate 2.90%  
Principal $ 500,000,000 0
Adjustments (5,500,000) 0
Carrying Value $ 494,500,000 0
Senior notes: March 2035    
Debt Instrument [Line Items]    
Interest Rate 6.086%  
Principal $ 181,900,000.0 275,700,000.0
Adjustments (15,400,000) (23,900,000)
Carrying Value $ 166,500,000 251,800,000
Senior notes: March 2040    
Debt Instrument [Line Items]    
Interest Rate 6.20%  
Principal $ 399,900,000.0 650,000,000.0
Adjustments (3,900,000) (6,600,000)
Carrying Value $ 396,000,000 643,400,000
Senior notes: May 2041    
Debt Instrument [Line Items]    
Interest Rate 5.70%  
Principal $ 385,700,000.0 600,000,000.0
Adjustments (5,600,000) (8,900,000)
Carrying Value $ 380,100,000 591,100,000
Debentures: May 2021    
Debt Instrument [Line Items]    
Interest Rate 9.25%  
Principal $ 35,300,000.0 35,300,000.0
Adjustments (1,100,000) (1,400,000)
Carrying Value $ 34,200,000 33,900,000
Debentures: September 2035    
Debt Instrument [Line Items]    
Interest Rate 7.40%  
Principal $ 148,100,000.0 165,200,000.0
Adjustments (35,200,000) (39,900,000)
Carrying Value 112,900,000 125,300,000
Tax-exempt: 2019 - 2044    
Debt Instrument [Line Items]    
Principal 1,079,100,000.0 1,079,100,000.0
Adjustments (6,400,000) (7,000,000)
Carrying Value 1,072,700,000 1,072,100,000
Other: 2017 - 2046    
Debt Instrument [Line Items]    
Principal 108,500,000.0 111,500,000.0
Adjustments $ 0 $ 0
Minimum | Tax-exempt: 2019 - 2044    
Debt Instrument [Line Items]    
Interest Rate 0.75%  
Minimum | Other: 2017 - 2046    
Debt Instrument [Line Items]    
Interest Rate 3.98%  
Maximum | Tax-exempt: 2019 - 2044    
Debt Instrument [Line Items]    
Interest Rate 5.625%  
Maximum | Other: 2017 - 2046    
Debt Instrument [Line Items]    
Interest Rate 12.203%