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Acquisitions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Jul. 13, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]          
General and administrative expenses   $ 74.7 $ 69.3 $ 226.9 $ 228.6
Subsequent Event [Member]          
Business Acquisition [Line Items]          
Upward adjustment $ 200.0        
Spectrum Merger [Member]          
Business Acquisition [Line Items]          
General and administrative expenses   $ 3.1 $ 1.4 $ 22.0 $ 4.2
Spectrum Merger [Member] | Subsequent Event [Member]          
Business Acquisition [Line Items]          
Transaction fees $ 29.8        
SBH Common Stock [Member] | HRG [Member] | Subsequent Event [Member]          
Business Acquisition [Line Items]          
Par value $ 0.01