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Share Based Compensation (Summary Of HRG Share-Based Awards) (Details)
$ / shares in Units, shares in Millions, $ in Millions
 9 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Granted, Fair Value at Grant Date | $ $ 36.5
Stock Options [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Options/Units/Shares | shares 4.0
Granted, Options/Units/Shares | shares
Exercised, Options/Units/Shares | shares (2.5)
Ending balance, Options/Units/Shares | shares 1.5
Vested/Exercisable, Options/Units/Shares | shares 1.3
Beginning balance, Weighted Average Exercise Price $ 9.69
Granted, Weighted Average Exercise Price
Exercised, Weighted Average Exercise Price (8.38)
Ending balance, Weighted Average Exercise Price 11.82
Vested/Exercisable, Weighted Average Exercise Price 11.09
Beginning balance, Weighted Average Grant Date Fair Value 3.88
Granted, Weighted Average Grant Date Fair Value
Exercised, Weighted Average Grant Date Fair Value (3.33)
Ending balance, Weighted Average Grant Date Fair Value 4.78
Vested/Exercisable, Weighted Average Grant Date Fair Value $ 4.53
Warrants [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Options/Units/Shares | shares 0.6
Granted, Options/Units/Shares | shares
Exercised, Options/Units/Shares | shares (0.6)
Ending balance, Options/Units/Shares | shares
Beginning balance, Weighted Average Exercise Price $ 13.13
Granted, Weighted Average Exercise Price
Exercised, Weighted Average Exercise Price (13.13)
Ending balance, Weighted Average Exercise Price
Beginning balance, Weighted Average Grant Date Fair Value 3.22
Granted, Weighted Average Grant Date Fair Value
Exercised, Weighted Average Grant Date Fair Value (3.22)
Ending balance, Weighted Average Grant Date Fair Value
Restricted Stock Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Beginning balance, Options/Units/Shares | shares 0.1
Granted, Options/Units/Shares | shares 0.1
Exercised, Options/Units/Shares | shares (0.1)
Ending balance, Options/Units/Shares | shares 0.1
Beginning balance, Weighted Average Grant Date Fair Value $ 13.36
Granted, Weighted Average Grant Date Fair Value 16.85
Exercised, Weighted Average Grant Date Fair Value (13.56)
Ending balance, Weighted Average Grant Date Fair Value $ 16.85
Beginning balance, Fair Value at Grant Date | $ $ 1.9
Granted, Fair Value at Grant Date | $ 0.4
Exercised, Fair Value at Grant Date | $ (1.9)
Ending balance, Fair Value at Grant Date | $ $ 0.4