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Long-term Debt and Line of Credit - Derivative Financial Instruments (Details)
$ in Millions
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
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 $ (0.2) $ 1.0    
Fair market value of interest rate swap liability $ 1.4      
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