Debt - Carrying Values of Debt Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2013
Debt Instrument [Line Items]
Finance lease liability	$ 107.7
Long-term debt, gross and lease obligation	8,540.0	$ 8,445.2
Adjustments	(94.8)	(107.7)
Finance leases		109.5
Total Debt	8,445.2	8,337.5
Less: current portion	(1,561.3)	(690.7)
Long-term portion	6,883.9	7,646.8
Uncommitted Credit Facility
Debt Instrument [Line Items]
Principal	89.0	33.4
Adjustments	0.0	0.0
Carrying Value	89.0	33.4
Credit facilities: June 2023
Debt Instrument [Line Items]
Principal	170.0	159.0
Adjustments	0.0	0.0
Carrying Value	$ 170.0	159.0
Senior notes: September 2019
Debt Instrument [Line Items]
Interest Rate	5.50%
Principal	$ 650.0	650.0
Adjustments	(0.3)	(0.9)
Carrying Value	$ 649.7	649.1
Senior notes: March 2020
Debt Instrument [Line Items]
Interest Rate	5.00%
Principal	$ 850.0	850.0
Adjustments	(0.6)	(1.0)
Carrying Value	$ 849.4	849.0
Senior notes: November 2021
Debt Instrument [Line Items]
Interest Rate	5.25%
Principal	$ 600.0	600.0
Adjustments	(1.0)	(1.2)
Carrying Value	$ 599.0	598.8
Senior notes: June 2022
Debt Instrument [Line Items]
Interest Rate	3.55%
Principal	$ 850.0	850.0
Adjustments	(3.2)	(3.6)
Carrying Value	$ 846.8	846.4
Senior notes: May 2023
Debt Instrument [Line Items]
Interest Rate	4.75%		4.75%
Principal	$ 550.0	550.0
Adjustments	3.7	(5.5)
Carrying Value	$ 553.7	544.5
Senior notes: March 2025
Debt Instrument [Line Items]
Interest Rate	3.20%
Principal	$ 500.0	500.0
Adjustments	(3.9)	(4.3)
Carrying Value	$ 496.1	495.7
Senior notes: June 2026
Debt Instrument [Line Items]
Interest Rate	2.90%
Principal	$ 500.0	500.0
Adjustments	(4.2)	(4.4)
Carrying Value	$ 495.8	495.6
Senior notes: November 2027
Debt Instrument [Line Items]
Interest Rate	3.375%
Principal	$ 650.0	650.0
Adjustments	(5.5)	(5.9)
Carrying Value	644.5	$ 644.1
Senior notes: May 2028
Debt Instrument [Line Items]
Interest Rate		3.95%
Principal	800.0	$ 800.0
Adjustments	(16.5)	(17.3)
Carrying Value	$ 783.5	782.7
Senior notes: March 2035
Debt Instrument [Line Items]
Interest Rate	6.086%
Principal	$ 181.9	181.9
Adjustments	(14.2)	(14.4)
Carrying Value	$ 167.7	167.5
Senior notes: March 2040
Debt Instrument [Line Items]
Interest Rate	6.20%
Principal	$ 399.9	399.9
Adjustments	(3.7)	(3.8)
Carrying Value	$ 396.2	396.1
Senior notes: May 2041
Debt Instrument [Line Items]
Interest Rate	5.70%
Principal	$ 385.7	385.7
Adjustments	(5.3)	(5.3)
Carrying Value	$ 380.4	380.4
Debentures: May 2021
Debt Instrument [Line Items]
Interest Rate	9.25%
Principal	$ 35.3	35.3
Adjustments	(0.6)	(0.7)
Carrying Value	$ 34.7	34.6
Debentures: September 2035
Debt Instrument [Line Items]
Interest Rate	7.40%
Principal	$ 148.1	148.1
Adjustments	(33.4)	(33.8)
Carrying Value	114.7	114.3
Tax-exempt: 2020 - 2049
Debt Instrument [Line Items]
Principal	1,072.4	1,042.4
Adjustments	(6.1)	(5.6)
Carrying Value	$ 1,066.3	$ 1,036.8
Tax-exempt: 2020 - 2049 \| Minimum
Debt Instrument [Line Items]
Interest Rate	1.50%
Tax-exempt: 2020 - 2049 \| Maximum
Debt Instrument [Line Items]
Interest Rate	1.95%
Finance leases: 2019-2046 \| Minimum
Debt Instrument [Line Items]
Interest Rate	3.07%
Finance leases: 2019-2046 \| Maximum
Debt Instrument [Line Items]
Interest Rate	12.203%

Long-term Debt, Gross And Lease Obligation

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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.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount (premium).

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and lease obligation, classified as noncurrent.

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