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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 |  |  |  |

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