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Debt and Credit Facilities (Schedule of Credit Facilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Line of Credit Facility [Line Items]    
Credit facilities outstanding   $ 1,110,756
Revolving Credit Facility | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding $ 0 0
Letter of Credit | Secured Bilateral Facility | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding   298,063
Letter of Credit | Unsecured Bilateral Facility | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding   381,770
Letter of Credit | Bank of Montreal, Citibank Europe and ING Bank | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding   290,000
TMR | Letter of Credit | Line of Credit    
Line of Credit Facility [Line Items]    
Credit facilities outstanding   $ 140,923