Long-term Debt (Summary of Long-Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Long-term debt	$ 2,866,563	$ 2,875,000
Unamortized discount	(22,088)	(23,167)
Unamortized deferred financing costs	(12,546)	(13,363)
Long-term debt, net	2,831,929	2,838,470
Current portion of long-term debt	33,750	33,750
Noncurrent portion of long-term debt	2,798,179	2,804,720
Senior Notes \| 5.00% Notes due April 2024
Debt Instrument [Line Items]
Long-term debt	$ 400,000	$ 400,000
Interest rate	5.00%	5.00%
Senior Notes \| 4.75% Notes due August 2025
Debt Instrument [Line Items]
Long-term debt	$ 800,000	$ 800,000
Interest rate	4.75%	4.75%
Senior Notes \| 4.25% Notes due February 2029
Debt Instrument [Line Items]
Long-term debt	$ 1,000,000	$ 1,000,000
Interest rate	4.25%	4.25%
Secured debt \| Term Loan A Facility
Debt Instrument [Line Items]
Long-term debt	$ 666,563	$ 675,000
Debt instrument, face amount	8,400
Revolving credit facility
Debt Instrument [Line Items]
Remaining undrawn capacity	$ 500,000

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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Face (par) amount of debt instrument at time of issuance.

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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.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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