v3.10.0.1

Debt - Carrying Values of Debt Instruments (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2013
Debt Instrument [Line Items]
Principal	$ 8,374,400,000	$ 8,281,700,000
Adjustments	(116,700,000)	(94,300,000)
Carrying Value	8,257,700,000	8,187,400,000
Less: current portion	(41,900,000)	(706,700,000)
Long-term portion	8,215,800,000	7,480,700,000
Uncommitted Credit Facility
Debt Instrument [Line Items]
Principal	44,700,000.0	0
Adjustments	0	0
Carrying Value	44,700,000	0
Credit facilities: June 2019
Debt Instrument [Line Items]
Principal	0	130,000,000
Adjustments	0	0
Carrying Value	0	130,000,000
Credit facilities: May 2021
Debt Instrument [Line Items]
Principal	0	0
Adjustments	0	0
Carrying Value	0	0
Credit facilities: June 2023
Debt Instrument [Line Items]
Principal	80,000,000	0
Adjustments	0	0
Carrying Value	$ 80,000,000	0
Senior notes: May 2018
Debt Instrument [Line Items]
Interest Rate	3.80%
Principal	$ 0	700,000,000
Adjustments	0	(300,000)
Carrying Value	$ 0	699,700,000
Senior notes: September 2019
Debt Instrument [Line Items]
Interest Rate	5.50%
Principal	$ 650,000,000	650,000,000
Adjustments	(1,500,000)	(2,100,000)
Carrying Value	$ 648,500,000	647,900,000
Senior notes: March 2020
Debt Instrument [Line Items]
Interest Rate	5.00%
Principal	$ 850,000,000	850,000,000
Adjustments	(1,300,000)	(1,800,000)
Carrying Value	$ 848,700,000	848,200,000
Senior notes: November 2021
Debt Instrument [Line Items]
Interest Rate	5.25%
Principal	$ 600,000,000	600,000,000
Adjustments	(1,400,000)	(1,500,000)
Carrying Value	$ 598,600,000	598,500,000
Senior notes: June 2022
Debt Instrument [Line Items]
Interest Rate	3.55%
Principal	$ 850,000,000	850,000,000
Adjustments	(4,100,000)	(4,600,000)
Carrying Value	$ 845,900,000	845,400,000
Senior notes: May 2023
Debt Instrument [Line Items]
Interest Rate	4.75%		4.75%
Principal	$ 550,000,000	550,000,000
Adjustments	(10,000,000)	(1,000,000)
Carrying Value	$ 540,000,000	549,000,000
Senior notes: March 2025
Debt Instrument [Line Items]
Interest Rate	3.20%
Principal	$ 500,000,000	500,000,000
Adjustments	(4,500,000)	(4,800,000)
Carrying Value	$ 495,500,000	495,200,000
Senior notes: June 2026
Debt Instrument [Line Items]
Interest Rate	2.90%
Principal	$ 500,000,000	500,000,000
Adjustments	(4,700,000)	(5,000,000)
Carrying Value	$ 495,300,000	495,000,000
Senior notes: November 2027
Debt Instrument [Line Items]
Interest Rate	3.375%
Principal	$ 650,000,000	650,000,000
Adjustments	(6,400,000)	(7,000,000)
Carrying Value	$ 643,600,000	643,000,000
Senior notes: May 2028
Debt Instrument [Line Items]
Interest Rate	3.95%
Principal	$ 800,000,000	0
Adjustments	(18,100,000)	0
Carrying Value	$ 781,900,000	0
Senior notes: March 2035
Debt Instrument [Line Items]
Interest Rate	6.086%
Principal	$ 181,900,000	181,900,000
Adjustments	(14,700,000)	(14,900,000)
Carrying Value	$ 167,200,000	167,000,000
Senior notes: March 2040
Debt Instrument [Line Items]
Interest Rate	6.20%
Principal	$ 399,900,000	399,900,000
Adjustments	(3,900,000)	(3,900,000)
Carrying Value	$ 396,000,000	396,000,000
Senior notes: May 2041
Debt Instrument [Line Items]
Interest Rate	5.70%
Principal	$ 385,700,000	385,700,000
Adjustments	(5,400,000)	(5,500,000)
Carrying Value	$ 380,300,000	380,200,000
Debentures: May 2021
Debt Instrument [Line Items]
Interest Rate	9.25%
Principal	$ 35,300,000	35,300,000
Adjustments	(800,000)	(1,000,000)
Carrying Value	$ 34,500,000	34,300,000
Debentures: September 2035
Debt Instrument [Line Items]
Interest Rate	7.40%
Principal	$ 148,100,000	148,100,000
Adjustments	(34,100,000)	(34,500,000)
Carrying Value	114,000,000	113,600,000
Tax-exempt: 2019 - 2044
Debt Instrument [Line Items]
Principal	1,042,400,000	1,042,400,000
Adjustments	(5,800,000)	(6,400,000)
Carrying Value	$ 1,036,600,000	1,036,000,000
Tax-exempt: 2019 - 2044 | Minimum
Debt Instrument [Line Items]
Interest Rate	1.45%
Tax-exempt: 2019 - 2044 | Maximum
Debt Instrument [Line Items]
Interest Rate	5.25%
Capital leases: 2017 - 2046
Debt Instrument [Line Items]
Principal	$ 106,400,000	108,400,000
Adjustments	0	0
Carrying Value	$ 106,400,000	$ 108,400,000
Capital leases: 2017 - 2046 | Minimum
Debt Instrument [Line Items]
Interest Rate	3.273%
Capital leases: 2017 - 2046 | Maximum
Debt Instrument [Line Items]
Interest Rate	12.203%

X

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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