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Share Based Compensation (Summary Of Share Based Compensation Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Share based compensation $ 49.2 $ 11.9 $ 54.2
Spectrum Equity Plan [Member]      
Share based compensation 49.2 10.5 49.0
HRG Equity Plan [Member]      
Share based compensation   1.4 5.2
SB/RH [Member]      
Share based compensation $ 47.6 $ 8.8 $ 46.2