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Derivatives (Outstanding Interest Rate Derivatives) (Details) - Long-term
$ in Millions
Jun. 30, 2021
USD ($)
Not Accounted for as Hedge | Swap 1.9%  
Derivative [Line Items]  
Notional amount $ 23.0
Interest rate 1.90%
Not Accounted for as Hedge | Swap 0.0% to 0.8% | Minimum  
Derivative [Line Items]  
Interest rate 0.00%
Not Accounted for as Hedge | Swap 0.0% to 0.8% | Maximum  
Derivative [Line Items]  
Interest rate 0.80%
Not Accounted for as Hedge | Swap 0.0% to 0.7% | Minimum  
Derivative [Line Items]  
Interest rate 0.00%
Not Accounted for as Hedge | Swap 0.0% to 0.7% | Maximum  
Derivative [Line Items]  
Interest rate 0.70%
Not Accounted for as Hedge | Swap 0.0% to 0.8% | Minimum  
Derivative [Line Items]  
Interest rate 0.00%
Not Accounted for as Hedge | Swap 0.0% to 0.8% | Maximum  
Derivative [Line Items]  
Interest rate 0.80%
Not Accounted for as Hedge | Swap 0.0% to 0.8% | Minimum  
Derivative [Line Items]  
Interest rate 0.00%
Not Accounted for as Hedge | Swap 0.0% to 0.8% | Maximum  
Derivative [Line Items]  
Interest rate 0.80%
Accounted for as Hedge | Swap 1.8%  
Derivative [Line Items]  
Notional amount $ 20.0
Interest rate 1.80%
Accounted for as Hedge | Swap 2.6%  
Derivative [Line Items]  
Notional amount $ 10.0
Interest rate 2.60%
Accounted for as Hedge | Swap 2.7%  
Derivative [Line Items]  
Notional amount $ 20.0
Interest rate 2.70%
Accounted for as Hedge | Swap 2.5%  
Derivative [Line Items]  
Notional amount $ 100.0
Interest rate 2.50%
Accounted for as Hedge | Swap 2.5%  
Derivative [Line Items]  
Notional amount $ 50.0
Interest rate 2.50%
Accounted for as Hedge | Swap 2.5%  
Derivative [Line Items]  
Notional amount $ 50.0
Interest rate 2.50%
Accounted for as Hedge | Swap 0.0% to 0.8%  
Derivative [Line Items]  
Notional amount $ 50.0
Accounted for as Hedge | Swap 0.0% to 0.7%  
Derivative [Line Items]  
Notional amount 50.0
Accounted for as Hedge | Swap 0.0% to 0.8%  
Derivative [Line Items]  
Notional amount 50.0
Accounted for as Hedge | Swap 0.0% to 0.8%  
Derivative [Line Items]  
Notional amount $ 50.0