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Long-term Debt (Summary of Long-Term Debt) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Feb. 08, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 2,876,500,000			$ 2,875,000,000
Unamortized discount	(24,249,000)			(18,337,000)
Unamortized deferred financing costs	(14,189,000)			(7,356,000)
Long-term debt, net	2,838,062,000			2,849,307,000
Current portion of long-term debt	26,813,000			75,000,000
Noncurrent portion of long-term debt	2,811,249,000			2,774,307,000
Senior Notes \| 4.75% Notes due December 2022
Debt Instrument [Line Items]
Long-term debt	$ 0			400,000,000
Interest rate	4.75%		4.75%
Senior Notes \| 5.00% Notes due April 2024
Debt Instrument [Line Items]
Long-term debt	$ 400,000,000			1,000,000,000
Interest rate	5.00%	5.00%	5.00%
Senior Notes \| 4.75% Notes due August 2025
Debt Instrument [Line Items]
Long-term debt	$ 800,000,000			800,000,000
Interest rate	4.75%
Senior Notes \| 4.25% Notes due February 2029
Debt Instrument [Line Items]
Long-term debt	$ 1,000,000,000			0
Interest rate	4.25%		4.25%
Debt instrument, face amount			$ 1,000,000,000
Senior Notes \| Other debt
Debt Instrument [Line Items]
Long-term debt	$ 1,500,000			0
Credit facilities \| Subsidiary Credit Facilities
Debt Instrument [Line Items]
Long-term debt	1,500,000
Debt instrument, face amount	$ 4,500,000
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	$ 675,000,000			$ 675,000,000
Debt instrument, face amount			675,000,000
Revolving credit facility
Debt Instrument [Line Items]
Remaining undrawn capacity	$ 500,000,000
Debt instrument, face amount			$ 500,000,000