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Acquisitions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 13, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |
Par value |  | $ 0.01 | $ 0.01 |
Upward adjustment | $ 200.0 |  |  |
General and administrative expenses |  | $ 354.6 | $ 335.8 | $ 355.2
Spectrum Merger [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Par value | $ 0.01 |  |  |
General and administrative expenses |  |  | $ 45.9 | $ 7.6

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