Debt - Carrying Values of Debt Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2013
Debt Instrument [Line Items]
Present value of lease liabilities	$ 108.5
Long-term debt, gross and lease obligation	8,499.1	$ 8,445.2
Adjustments	(102.0)	(107.7)
Finance lease liability	108.5
Capital Lease Obligations		109.5
Total Debt	8,397.1	8,337.5
Less: current portion	(1,595.6)	(690.7)
Long-term portion	6,801.5	7,646.8
Uncommitted Credit Facility
Debt Instrument [Line Items]
Carrying Value	87.3	33.4
Adjustments	0.0	0.0
Carrying Value	87.3	33.4
Credit facilities: June 2019
Debt Instrument [Line Items]
Carrying Value	0.0	0.0
Adjustments	0.0	0.0
Carrying Value	0.0	0.0
Credit facilities: May 2021
Debt Instrument [Line Items]
Carrying Value	0.0	0.0
Adjustments	0.0	0.0
Carrying Value	0.0	0.0
Credit facilities: June 2023
Debt Instrument [Line Items]
Carrying Value	160.0	159.0
Adjustments	0.0	0.0
Carrying Value	$ 160.0	159.0
Senior notes: September 2019
Debt Instrument [Line Items]
Interest Rate	5.50%
Carrying Value	$ 650.0	650.0
Adjustments	(0.6)	(0.9)
Carrying Value	$ 649.4	649.1
Senior notes: March 2020
Debt Instrument [Line Items]
Interest Rate	5.00%
Carrying Value	$ 850.0	850.0
Adjustments	(0.8)	(1.0)
Carrying Value	$ 849.2	849.0
Senior notes: November 2021
Debt Instrument [Line Items]
Interest Rate	5.25%
Carrying Value	$ 600.0	600.0
Adjustments	(1.1)	(1.2)
Carrying Value	$ 598.9	598.8
Senior notes: June 2022
Debt Instrument [Line Items]
Interest Rate	3.55%
Carrying Value	$ 850.0	850.0
Adjustments	(3.3)	(3.6)
Carrying Value	$ 846.7	846.4
Senior notes: May 2023
Debt Instrument [Line Items]
Interest Rate	4.75%		4.75%
Carrying Value	$ 550.0	550.0
Adjustments	(2.0)	(5.5)
Carrying Value	$ 548.0	544.5
Senior notes: March 2025
Debt Instrument [Line Items]
Interest Rate	3.20%
Carrying Value	$ 500.0	500.0
Adjustments	(4.1)	(4.3)
Carrying Value	$ 495.9	495.7
Senior notes: June 2026
Debt Instrument [Line Items]
Interest Rate	2.90%
Carrying Value	$ 500.0	500.0
Adjustments	(4.3)	(4.4)
Carrying Value	$ 495.7	495.6
Senior notes: November 2027
Debt Instrument [Line Items]
Interest Rate	3.375%
Carrying Value	$ 650.0	650.0
Adjustments	(5.8)	(5.9)
Carrying Value	$ 644.2	644.1
Senior notes: May 2028
Debt Instrument [Line Items]
Interest Rate	3.95%
Carrying Value	$ 800.0	800.0
Adjustments	(16.9)	(17.3)
Carrying Value	$ 783.1	782.7
Senior notes: March 2035
Debt Instrument [Line Items]
Interest Rate	6.086%
Carrying Value	$ 181.9	181.9
Adjustments	(14.3)	(14.4)
Carrying Value	$ 167.6	167.5
Senior notes: March 2040
Debt Instrument [Line Items]
Interest Rate	6.20%
Carrying Value	$ 399.9	399.9
Adjustments	(3.8)	(3.8)
Carrying Value	$ 396.1	396.1
Senior notes: May 2041
Debt Instrument [Line Items]
Interest Rate	5.70%
Carrying Value	$ 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%
Carrying Value	$ 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%
Carrying Value	$ 148.1	148.1
Adjustments	(33.6)	(33.8)
Carrying Value	114.5	114.3
Tax-exempt: 2019 - 2044
Debt Instrument [Line Items]
Carrying Value	1,042.4	1,042.4
Adjustments	(5.5)	(5.6)
Carrying Value	$ 1,036.9	$ 1,036.8
Tax-exempt: 2019 - 2044 \| Minimum
Debt Instrument [Line Items]
Interest Rate	195.00%
Tax-exempt: 2019 - 2044 \| Maximum
Debt Instrument [Line Items]
Interest Rate	250.00%
Finance leases: 2019-2046 \| Minimum
Debt Instrument [Line Items]
Interest Rate	307.00%
Finance leases: 2019-2046 \| Maximum
Debt Instrument [Line Items]
Interest Rate	1220.30%

Long-term Debt, Gross And Lease Obligation

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- 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.

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- Definition

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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- Definition

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

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- Definition

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.

+ References

No definition available.

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- Definition

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

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- Definition

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

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- Definition

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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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

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Amount of long-term debt and capital lease obligations including current maturities.

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