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Derivative Instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Nov. 14, 2018
Derivative [Line Items]            
Settlement value of interest rate swap liability before tax $ 2.9 $ 2.9   $ 5.3    
Receive Variable Pay Fixed Rate | Interest Rate Swap            
Derivative [Line Items]            
Interest rate swap notional amount           $ 410.0
Derivatives interest rate swap fixed interest rate           2.9065%
Gain (Loss) on Fair Value Hedges Recognized in Earnings $ 2.9 $ 6.7 $ 9.5 $ 2.7 $ 0.0