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Share Based Compensation (Summary Of HRG Share-Based Awards) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
9 Months Ended 12 Months Ended
Jul. 13, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning balance, Fair Value at Grant Date $ 87.2 $ 87.2 $ 54.8 $ 53.2
Grants, Fair Value at Grant Date   45.9 88.4 56.0
Ending balance, Fair Value at Grant Date   $ 69.0 $ 87.2 $ 54.8
HRG [Member] | Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning balance, Options/Units/Shares 4.0 4.0 4.2 4.7
Granted, Options/Units/Shares   0.3 0.1
Exercised, Options/Units/Shares (2.5)   (0.5) (0.6)
Ending balance, Options/Units/Shares 1.5   4.0 4.2
Vested and exercisable, Options/Units/Shares   0.2    
Beginning balance, Weighted Average Exercise Price $ 9.69 $ 9.69 $ 9.48 $ 9.25
Granted, Weighted Average Exercise Price   15.39 13.93
Exercised, Weighted Average Exercise Price (8.38)   11.28 7.82
Ending balance, Weighted Average Exercise Price 11.80   9.69 9.48
Vested and exercisable, Weighted Average Exercise Price   73.29    
Beginning balance, Weighted Average Grant Date Fair Value 3.88 3.88 3.80 3.70
Granted, Weighted Average Grant Date Fair Value   5.96 5.07
Exercised, Weighted Average Grant Date Fair Value (3.33)   4.48 3.05
Ending balance, Weighted Average Grant Date Fair Value $ 4.78   $ 3.88 $ 3.80
Vested and exercisable, Weighted Average Grant Date Fair Value   $ 4.78    
HRG [Member] | Warrants [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning balance, Options/Units/Shares 0.6 0.6 1.2 1.8
Granted, Options/Units/Shares  
Exercised, Options/Units/Shares (0.6)   (0.6) (0.6)
Ending balance, Options/Units/Shares   0.6 1.2
Vested and exercisable, Options/Units/Shares      
Beginning balance, Weighted Average Exercise Price $ 13.13 $ 13.13 $ 13.13 $ 13.13
Granted, Weighted Average Exercise Price  
Exercised, Weighted Average Exercise Price 13.13   13.13 13.13
Ending balance, Weighted Average Exercise Price   13.13 13.13
Vested and exercisable, Weighted Average Exercise Price      
Beginning balance, Weighted Average Grant Date Fair Value 3.22 3.22 6.44 9.66
Granted, Weighted Average Grant Date Fair Value  
Exercised, Weighted Average Grant Date Fair Value (3.22)   (3.22) (3.22)
Ending balance, Weighted Average Grant Date Fair Value   $ 3.22 $ 6.44
Vested and exercisable, Weighted Average Grant Date Fair Value      
HRG [Member] | Restricted Stock Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning balance, Options/Units/Shares 0.1 0.1 2.0 4.3
Granted, Options/Units/Shares 0.1   0.1 0.1
Exercised, Options/Units/Shares (0.2)   (2.0) (2.4)
Ending balance, Options/Units/Shares   0.1 2.0
Beginning balance, Weighted Average Exercise Price $ 13.36 $ 13.36 $ 12.74 $ 11.74
Granted, Weighted Average Exercise Price 16.85   15.71 13.93
Exercised, Weighted Average Exercise Price (13.85)   12.73 11.01
Ending balance, Weighted Average Exercise Price     $ 13.36 $ 12.74
Ending balance, Weighted Average Grant Date Fair Value      
Beginning balance, Fair Value at Grant Date $ 1.9 $ 1.9 $ 25.2 $ 50.3
Grants, Fair Value at Grant Date 0.4   0.3 1.4
Exercised, Fair Value at Grant Date (2.3)   (23.6) (26.5)
Ending balance, Fair Value at Grant Date   $ 1.9 $ 25.2
HRG [Member] | Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning balance, Options/Units/Shares 0.1 0.1
Granted, Options/Units/Shares   0.1
Exercised, Options/Units/Shares   (0.1) (0.1)
Ending balance, Options/Units/Shares   0.1
Beginning balance, Weighted Average Exercise Price $ 12.33 $ 12.33
Granted, Weighted Average Exercise Price   13.93
Exercised, Weighted Average Exercise Price   12.33 13.93
Ending balance, Weighted Average Exercise Price     $ 12.33
Ending balance, Weighted Average Grant Date Fair Value      
Beginning balance, Fair Value at Grant Date $ 0.5 $ 0.5
Grants, Fair Value at Grant Date   0.1
Exercised, Fair Value at Grant Date   (0.5) (0.1)
Ending balance, Fair Value at Grant Date   $ 0.5