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Derivatives and Hedging Activities (Narrative) (Details) - USD ($)
6 Months Ended 12 Months Ended
Aug. 04, 2020
Jun. 30, 2021
Dec. 31, 2020
Interest Rate Swap [Member]      
Derivative [Line Items]      
Accumulated derivative losses   $ 92,500,000 $ 140,900,000
Interest Rate Swap [Member] | Minimum [Member]      
Derivative [Line Items]      
Remaining maturity year   2023  
Interest Rate Swap [Member] | Maximum [Member]      
Derivative [Line Items]      
Remaining maturity year   2025  
2018 Term Loan [Member] | Interest Rate Swap [Member]      
Derivative [Line Items]      
Notional amount   $ 1,950,000,000  
Derivative fixed interest rate   1.874%  
Derivative asset, fair value   $ 38,000,000.0 $ 12,100,000
Cash Flow Hedges [Member] | Interest Rate Swap [Member]      
Derivative [Line Items]      
Cash transfer in connection with termination of swaps $ 0    
Cash Flow Hedges [Member] | 2018 Term Loan [Member]      
Derivative [Line Items]      
Notional amount   1,950,000,000  
Payment to terminate   $ 176,200,000  
London Interbank Offered Rate (LIBOR) [Member] | 2018 Term Loan [Member] | Interest Rate Swap [Member]      
Derivative [Line Items]      
Derivative basis spread on variable interest rate   1.75%