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Long-term Debt and Line of Credit - Derivative Financial Instruments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 31, 2020
USD ($)
Sep. 16, 2015
USD ($)
contract
Debt Instrument [Line Items]          
Percent Of aggregate principal amount hedged         50.00%
Change in fair market value of interest rate swaps $ 0.6 $ 1.0      
Fair market value of interest rate swap liability $ 1.6        
Maximum          
Debt Instrument [Line Items]          
Change in fair market value of interest rate swaps     $ 0.1    
Series of Swaps          
Debt Instrument [Line Items]          
Derivative, notional amount         $ 67.5
Derivative, number of instruments held | contract         5
Sixth Swap          
Debt Instrument [Line Items]          
Derivative, notional amount       $ 27.0