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Debt and Credit Facilities 1.5% Convertible Debentures due 2035 (Details) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Jun. 01, 2015
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 1,896,500 $ 2,137,000  
Debt Issuance Costs, Noncurrent, Net $ 229,655 $ 511  
Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount     $ 263,900
Debt Instrument, Interest Rate, Stated Percentage 1.50% 1.50%  
Debt Instrument, Convertible, Conversion Price     $ 20.61
Debt issuance Percentage of Principal Amount     97.09%
Debt Instrument, Unamortized Discount (Premium), Net     $ 7,700
Debt Instrument, Unamortized Discount $ 15,053 $ 22,717  
Convertible Debt, Noncurrent     208,600
Debt Instrument, Convertible, Carrying Amount of Equity Component     $ 55,300
Debt Instrument, Repurchased Face Amount 36,500    
Debt Instrument, Repurchase Amount 41,300    
debt repurchase allocation - Debt portion 34,700    
Debt repurchase allocation - Equity portion 6,600    
Unamortized Loss Reacquired Debt, Noncurrent 2,500    
debt issuance cost write off 100    
loss on extinguishment of debt 800    
Debtor-in-Possession Financing, Borrowings Outstanding $ 227,400    
Before auto spin-off [Member] | Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member]      
Debt Instrument [Line Items]      
Convertible debt shares per $1,000 principal amount     42.9978
After auto spin-off [Member] | Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member]      
Debt Instrument [Line Items]      
Convertible debt shares per $1,000 principal amount     48.5216