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Derivatives and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 04, 2020
Dec. 31, 2020
Dec. 31, 2019
Interest Rate Swap [Member]      
Derivative [Line Items]      
Accumulated derivative losses   $ 140.9 $ 42.1
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 $ 1,950.0 $ 1,950.0  
Derivative fixed interest rate 1.874% 1.874%  
Derivative asset, fair value   $ 12.1  
Cash Flow Hedges [Member] | 2018 Term Loan [Member]      
Derivative [Line Items]      
Notional amount $ 1,950.0    
Payment to terminate $ 176.2    
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% 1.75%