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Share Based Compensation (Narrative) (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
Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares, right to purchase     0.7 0.6
Annual Management Incentive Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total share based compensation   $ 10.1 $ 12.9 $ 8.9
HRG Equity Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares, available for issuance   1.4    
HRG Equity Plan [Member] | HRG [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining unrecognized pre-tax compensation cost   $ 0.0    
HRG Equity Plan [Member] | Common Stock [Member] | HRG [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized issuance shares   24.0    
HRG Warrant Plan [Member] | Common Stock [Member] | Former Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares, right to purchase   3.0    
Exercise price per share   $ 13.125    
Shares, vested   0.6    
Vesting period   4 years    
Estimated grant date fair value   $ 9.6    
Spectrum Equity Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares, available for issuance   1.6    
Restricted Stock Units [Member] | Specturm And SB/RH [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining unrecognized pre-tax compensation cost   $ 8.1    
Restricted Stock Units [Member] | HRG [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares, right to purchase   0.1 0.1
Exercise price per share   $ 13.93
Stock Options [Member] | HRG [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares, right to purchase 2.5   0.5 0.6
Exercise price per share   $ 15.39 $ 13.93
Total fair value vested   0.8    
Intrinsic value of options exercised   21.5    
Cash settlement   $ 19.9    
Shares, vested and exercisable   0.2    
Weighted average exercise price of vested and exercisable   $ 73.29    
Maximum [Member] | Spectrum Equity Plan [Member] | Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Authorized issuance shares   7.1