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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%