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Derivatives (Outstanding Interest Rate Derivatives) (Details) - Long-term
$ in Millions
Sep. 30, 2019
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 | Collar 3.5% to 4.8%  
Derivative [Line Items]  
Notional amount $ 40.0
Not Accounted for as Hedge | Collar 3.5% to 4.8% | Minimum  
Derivative [Line Items]  
Interest rate 3.50%
Not Accounted for as Hedge | Collar 3.5% to 4.8% | Maximum  
Derivative [Line Items]  
Interest rate 4.80%
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 2.6%  
Derivative [Line Items]  
Notional amount $ 40.0
Interest rate 2.60%
Accounted for as Hedge | Swap 2.5%  
Derivative [Line Items]  
Notional amount $ 25.0
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 $ 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%