Debt (Tax-Exempt Financings) (Details) - USD ($)	3 Months Ended	12 Months Ended
Dec. 31, 2017	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt		$ 8,445,200,000
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 8,187,400,000	$ 8,337,500,000
Approval of bond Issuance by regulatory agency, maximum authorization	100,000,000.0
Percentage of tax-exempt financings remarketed		100.00%
5.25% tax exempt bonds
Debt Instrument [Line Items]
Debt retired	$ 86,700,000
Interest rate	5.25%
Variable rate tax exempt debt
Debt Instrument [Line Items]
Long-term debt	$ 50,000,000.0
Tax-exempt: 2019 - 2044
Debt Instrument [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 1,036,000,000.0	$ 1,036,800,000

Approval of Bond Issuance by Regulatory Agency, Maximum Authorization

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Percentage of tax-exempt financings.

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- Definition

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

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-Publisher FASB
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Gross amount of debt extinguished.

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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 capital lease obligations including current maturities.

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