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Acquisitions - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 26, 2020 | Mar. 10, 2020 | Jul. 13, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 1,332.0 | $ 1,328.1 | $ 1,454.7
Par value (in dollars per share) |  |  |  | $ 0.01 | $ 0.01 |
Upward adjustment |  |  | $ 200.0 |  |  |
General and administrative expenses |  |  |  | $ 337.8 | $ 354.6 | 335.8
GPC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  | $ 431.6 | $ 430.4 | 435.9
Omega Sea acquisition |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  | $ 16.9 |  |  |  |
Omega Sea acquisition | GPC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Indefinite lived intangible assets |  | 4.4 |  |  |  |
Goodwill |  | $ 8.6 |  |  |  |
Spectrum Merger |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Par value (in dollars per share) |  |  | $ 0.01 |  |  |
General and administrative expenses |  |  |  |  |  | $ 45.9
Armitage | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price | $ 187.0 |  |  |  |  |

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