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Credit Facilities and Debt 1.25% Convertible Debentures due 2025 (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 65 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2018
Jun. 30, 2020
Mar. 31, 2020
Nov. 01, 2017
Mar. 13, 2017
Dec. 07, 2015
Jun. 01, 2015
Oct. 24, 2011
Debt Instrument [Line Items]                                
Long-term debt, face value           $ 1,666.5 $ 2,137.0                  
Stock Repurchased and Retired During Period, Shares   5,800,000       9,500,000 8,200,000 9,700,000 73,800,000              
Stock Repurchased During Period, Value   $ 99.1       $ 169.2 $ 126.9 $ 136.1 $ 1,238.8              
Convertible Debentures 1.25% Due 2025 [Member]                                
Debt Instrument [Line Items]                                
debt repurchase allocation - Debt portion                     $ 72.8          
Debt repurchase allocation - Equity portion                     39.5          
Unamortized Loss Reacquired Debt, Noncurrent                     16.7          
debt issuance cost write off                     0.7          
loss on extinguishment of debt                     2.8          
Debtor-in-Possession Financing, Borrowings Outstanding                     262.7          
Long-term debt, face value                         $ 350.0      
Convertible debentures, interest rate           1.25% 1.25%           1.25%      
Debt Instrument, Repurchase Amount                     112.3          
Debt Instrument, Repurchased Face Amount                     87.3          
Proceeds from long-term debt, net of issuance costs         $ 343.6                      
Convertible Debt, Noncurrent                         $ 252.1      
Debt Instrument, Convertible, Carrying Amount of Equity Component                         $ 97.9      
Debt Instrument, Convertible, Conversion Price                         $ 19.69      
Ratio of Common Stock Closing Price to Debt Conversion Price, Percentage             130.00%                  
Convertible Debentures 1.25% Due 2025 [Member] | Minimum                                
Debt Instrument [Line Items]                                
Debt Instrument Conversion Circumstance Number Of Trading Days           20 days                    
2.75% Convertible Debentures due November 1, 2031                                
Debt Instrument [Line Items]                                
Long-term debt, face value                       $ 46.6   $ 395.5   $ 690.0
Convertible debentures, interest rate       2.75%   2.75% 2.75%                 2.75%
Repayments of Convertible Debt $ 331.2   $ 256.2 $ 38.3   $ 17.8 $ 38.3                  
Convertible Debt, Noncurrent                               $ 533.6
Debt Instrument, Convertible, Carrying Amount of Equity Component                               $ 156.4
Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member]                                
Debt Instrument [Line Items]                                
debt repurchase allocation - Debt portion                     34.7          
Debt repurchase allocation - Equity portion                     6.6          
Unamortized Loss Reacquired Debt, Noncurrent                     2.5          
debt issuance cost write off                     0.1          
loss on extinguishment of debt                     0.8          
Debtor-in-Possession Financing, Borrowings Outstanding                   $ 227.4            
Long-term debt, face value                             $ 263.9  
Convertible debentures, interest rate           1.50% 1.50%                  
Debt Instrument, Repurchase Amount                     41.3          
Debt Instrument, Repurchased Face Amount                     $ 36.5          
Convertible Debt, Noncurrent                             208.6  
Debt Instrument, Convertible, Carrying Amount of Equity Component                             $ 55.3  
Debt Instrument, Convertible, Conversion Price                             $ 20.61  
Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member] | Minimum                                
Debt Instrument [Line Items]                                
Ratio of Common Stock Closing Price to Debt Conversion Price, Percentage             130.00%                  
Debt Instrument Conversion Circumstance Number Of Trading Days           20 days                    
After auto spin-off [Member] | Convertible Debentures 1.25% Due 2025 [Member]                                
Debt Instrument [Line Items]                                
Convertible debt shares per $1,000 principal amount                         50.7957      
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  
Ending on Last Trading Day of Previous Fiscal Quarter [Member] | Convertible Debentures 1.25% Due 2025 [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument Conversion Circumstance Number Of Consecutive Trading Days           30 days                    
Ending on Last Trading Day of Previous Fiscal Quarter [Member] | Convertible Debentures One Point Five Percent Due November One Twenty Thirty Five [Member] [Member]                                
Debt Instrument [Line Items]                                
Debt Instrument Conversion Circumstance Number Of Consecutive Trading Days           30 days                    
Before auto spin-off [Member] | Convertible Debentures 1.25% Due 2025 [Member]                                
Debt Instrument [Line Items]                                
Convertible debt shares per $1,000 principal amount                         45.0106      
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