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Long-Term Debt - WML Senior Notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 26, 2020
Debt Instrument [Line Items]
Payment of related fees and expenses	$ 27,339,000	$ 32,738,000	$ 48,297,000
2027 and 2028 WML Senior Notes | Senior Notes | WML
Debt Instrument [Line Items]
Payment of related fees and expenses	20,700,000
Debt issuance costs	$ 20,700,000
2027 and 2028 WML Senior Notes | Senior Notes | WML | Material Adverse Effect
Debt Instrument [Line Items]
Minimum number of consecutive days	10 days
Debt redemption price as percentage of principal	100.00%
WML 5 1/2% Senior Notes, due 2026 | Senior Notes | WML
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount	$ 1,000,000,000.0
Debt instrument, interest rate	5.50%
WML 5 5/8% Senior Notes, due 2028 | Senior Notes | WML
Debt Instrument [Line Items]
Debt instrument, aggregate principal amount				$ 1,350,000,000
Debt instrument, interest rate	5.625%
WML 5 5/8% Senior Notes, due 2028 | Senior Notes | WML | Change of Control
Debt Instrument [Line Items]
Debt redemption price as percentage of principal	101.00%
WML 4 7/8% Senior Notes, due 2024 | Senior Notes | WML
Debt Instrument [Line Items]
Debt instrument, interest rate	4.875%
WML 5 1/2% Senior Notes, due 2027 | Senior Notes | WML
Debt Instrument [Line Items]
Debt instrument, interest rate	5.50%
WML 5 1/8% Senior Notes, due 2029 | Senior Notes | WML
Debt Instrument [Line Items]
Debt instrument, interest rate	5.125%

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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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