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Debt and Credit Facilities 1.25% Convertible Debentures due 2025 (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 86 Months Ended
Mar. 01, 2017
Mar. 31, 2020
Nov. 30, 2017
Jun. 30, 2019
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Sep. 30, 2019
Mar. 13, 2017
Jun. 01, 2015
Oct. 24, 2011
Debt Instrument [Line Items]                          
Debt Instrument, Face Amount             $ 1,666.5   $ 1,666.5 $ 2,137.0      
Stock Repurchased and Retired During Period, Shares       1,700,000     9,500,000 7,800,000 73,800,000        
Stock Repurchased During Period, Value       $ 29.6     $ 169.2 $ 120.9 $ 1,238.8        
Convertible Debentures 1.25% Due 2025 [Member]                          
Debt Instrument [Line Items]                          
Convertible Debt, Noncurrent                     $ 252.1    
Debt Instrument, Face Amount                     $ 350.0    
Debt Instrument, Interest Rate, Stated Percentage             1.25%   1.25% 1.25% 1.25%    
debt instrument net proceeds                     $ 343.6    
Stock Repurchased and Retired During Period, Shares 5,800,000                        
Stock Repurchased During Period, Value $ 99.1                        
Debt Instrument, Convertible, Carrying Amount of Equity Component                     $ 97.9    
Debt Instrument, Convertible, Conversion Price                     $ 19.69    
Debt Instrument, Repurchased Face Amount   $ 87.3                      
Debt Instrument, Repurchase Amount   112.3                      
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   $ 262.7        
Convertible Debentures Two Point Seven Five Percent Due November One Twenty Thirty One [Member]                          
Debt Instrument [Line Items]                          
Convertible Debt, Noncurrent                         $ 533.6
Debt Instrument, Face Amount   46.6                   $ 395.5 $ 690.0
Debt Instrument, Interest Rate, Stated Percentage             2.75%   2.75% 2.75%     2.75%
debt instrument net proceeds                         $ 676.1
Repayments of Convertible Debt         $ 256.2 $ 38.3              
Repayments of Debt $ 17.8 $ 46.6 $ 331.2                    
Debt Instrument, Convertible, Carrying Amount of Equity Component                         156.4
Debt Instrument, Repurchased Face Amount                         $ 38.3
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    
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