Debt (Components of Long-term Debt) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total face value	$ 3,350,000	$ 1,750,000
Less: unamortized discount	(6,518)	(5,594)
Less: unamortized issuance costs	(18,363)	(11,784)
Total long-term debt	3,325,119	1,732,622
2026 Notes [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Total face value	750,000	0
Total long-term debt	742,447
2027 Notes [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Total face value	750,000	750,000
Total long-term debt	744,484
2030 Notes [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Total face value	750,000	750,000
Total long-term debt	739,991
2021 Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Total face value	1,000,000	0
2020 Credit Agreement [Member] \| 3-year Term Loan Facility [Member]
Debt Instrument [Line Items]
Total face value	$ 100,000	$ 250,000

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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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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- 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

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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