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Debt -Term Loans, Medium Term Notes and Revenue Bonds - (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2021
Debt Instrument [Line Items]      
Proceeds from Issuance of Debt $ 40.0 $ 46.0  
Interest Rate 3.10% 3.04% 3.10%
Debt instrument maturity date   2030  
Term loan maturity period 2031-11    
Interest Rate Swaps [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Gross $ 40.0 $ 46.0 $ 40.0
Amended Term Loan Agreement [Member]      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding $ 693.5   $ 693.5
London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 2.10% 2.10% 1.00%