Long-term Debt (Summary of Long-Term Debt) (Details) - USD ($)	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 2,918,500,000	$ 3,131,250,000
Unamortized discount	(20,696,000)	(24,351,000)
Unamortized deferred financing costs	(8,914,000)	(10,670,000)
Long-term debt, net	2,888,890,000	3,096,229,000
Current portion of long-term debt	81,000,000	56,250,000
Long-term debt	$ 2,807,890,000	3,039,979,000
4.75% Notes due August 2025
Debt Instrument [Line Items]
Interest rate	4.75%
5.00% Notes due April 2024
Debt Instrument [Line Items]
Interest rate	5.00%
4.75% Notes due December 2022
Debt Instrument [Line Items]
Interest rate	4.75%
Senior Notes \| 4.75% Notes due August 2025
Debt Instrument [Line Items]
Long-term debt	$ 800,000,000	800,000,000
Senior Notes \| 5.00% Notes due April 2024
Debt Instrument [Line Items]
Long-term debt	1,000,000,000	1,000,000,000
Senior Notes \| 4.75% Notes due December 2022
Debt Instrument [Line Items]
Long-term debt	400,000,000	600,000,000
Senior Notes \| Other debt
Debt Instrument [Line Items]
Long-term debt	6,000,000	0
Credit facilities \| Subsidiary credit facilities
Debt Instrument [Line Items]
Long-term debt	6,000,000.0
Total credit facilities	$ 7,000,000.0
Credit facilities \| Subsidiary credit facilities \| Prime rate
Debt Instrument [Line Items]
Debt, basis spread on rate	1.00%
Credit facilities \| Subsidiary credit facilities \| Minimum
Debt Instrument [Line Items]
Interest rate	3.50%
Secured debt \| Term Loan A Facility
Debt Instrument [Line Items]
Long-term debt	$ 712,500,000	$ 731,250,000
Revolving credit facility
Debt Instrument [Line Items]
Remaining undrawn capacity	$ 500,000,000

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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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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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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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 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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