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Debt and Credit Facilities 1.0% Convertible Debentures due 2035 (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2020
Nov. 30, 2017
Jun. 30, 2015
Dec. 31, 2014
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2019
Dec. 07, 2015
Jun. 01, 2015
Oct. 24, 2011
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount $ 1,896,500       $ 1,896,500   $ 2,137,000      
Debt Issuance Costs, Noncurrent, Net $ 229,655       229,655   $ 511      
Loss on extinguishment of debt         $ 18,656 $ 910        
Convertible Debentures One Percent Due Twenty Thirty Five [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount               $ 676,500    
Debt Instrument, Convertible, Carrying Amount of Equity Component               $ 181,100    
Debt Instrument, Convertible, Conversion Price               $ 24.12    
Debt Instrument, Interest Rate, Stated Percentage 1.00%       1.00%   1.00% 1.00%    
Debt Instrument, Repurchased Face Amount               $ 472,500    
debt instrument net proceeds               663,800    
Convertible Debt, Noncurrent               $ 495,400    
Convertible Debentures Two Point Seven Five Percent Due November One Twenty Thirty One [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount $ 46,600       $ 46,600       $ 395,500 $ 690,000
Debt Instrument, Convertible, Carrying Amount of Equity Component                   $ 156,400
Repayments of Convertible Debt     $ 256,200 $ 38,300            
Debt Instrument, Interest Rate, Stated Percentage 2.75%       2.75%   2.75%     2.75%
Debt Instrument, Repurchased Face Amount                   $ 38,300
debt instrument net proceeds                   676,100
Repayments of Debt $ 46,600 $ 331,200                
Convertible Debt, Noncurrent                   $ 533,600
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, Convertible, Carrying Amount of Equity Component                 $ 55,300  
Debt Instrument, Convertible, Conversion Price                 $ 20.61  
Debt Instrument, Interest Rate, Stated Percentage 1.50%       1.50%   1.50%      
Debt Instrument, Repurchased Face Amount $ 36,500       $ 36,500          
Convertible Debt, Noncurrent                 $ 208,600  
Before auto spin-off [Member] | Convertible Debentures One Percent Due Twenty Thirty Five [Member]                    
Debt Instrument [Line Items]                    
Convertible debt shares per $1,000 principal amount               36.7360    
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 Percent Due Twenty Thirty Five [Member]                    
Debt Instrument [Line Items]                    
Convertible debt shares per $1,000 principal amount               41.4576    
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