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Restructuring Charges - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 97.4 | $ 0.0 | $ 0.0
Restructuring charges, net of tax | $ 73.1 |  |
Restructuring charges, per diluted share (in USD per share) | $ 0.64 |  |
Expected restructuring charges | $ 97.4 |  |
Payments | 27.7 |  |
Cost of sales |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 31.5 |  |
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] | Cost of Goods and Services Sold |  |
Selling, general and administrative expenses |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 65.9 |  |
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] | Selling, General and Administrative Expense |  |
Severance Benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 92.3 |  |
Payments | 22.6 |  |
Strategic Advisory Services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 5.1 |  |
Payments | $ 5.1 |  |

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