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Acquisitions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jul. 13, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Acquisition [Line Items]          
Upward adjustment $ 200.0        
General and administrative expenses   $ 80.6 $ 76.1 $ 263.6 $ 238.4
Spectrum Merger [Member]          
Business Acquisition [Line Items]          
General and administrative expenses     $ 3.1   $ 22.0
SBH Common Stock [Member] | HRG [Member]          
Business Acquisition [Line Items]          
Par value $ 0.01