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Significant Accounting Policies and Practices - Summary Of Transactions Related Charges (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |
Total transaction-related charges | $ 23.1 | $ 21.8 | $ 30.2
Coevorden operations divestiture |  |  |
Business Acquisition [Line Items] |  |  |
Total transaction-related charges | 5.5 | 0.0 | 0.0
GBL post divestiture separation |  |  |
Business Acquisition [Line Items] |  |  |
Total transaction-related charges | 10.2 | 9.5 | 0.0
HPC divestiture |  |  |
Business Acquisition [Line Items] |  |  |
Total transaction-related charges | 3.9 | 7.3 | 14.9
PetMatrix integration |  |  |
Business Acquisition [Line Items] |  |  |
Total transaction-related charges | 0.0 | 0.0 | 4.9
Omega Sea acquisition |  |  |
Business Acquisition [Line Items] |  |  |
Total transaction-related charges | 1.6 | 0.0 | 0.0
Other integration |  |  |
Business Acquisition [Line Items] |  |  |
Total transaction-related charges | $ 1.9 | $ 5.0 | $ 10.4

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- Definition Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs. + References No definition available. + Details
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