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v3.25.4

Intangible Assets and Goodwill - Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Sep. 30, 2025
--- | --- | ---
Intangible Assets [Line Items] |  |
Cost | $ 1,556.5 | $ 1,549.1
Accumulated Amortization | (615.1) | (588.4)
Total | 1,732.0 | 1,724.4
Trade names |  |
Intangible Assets [Line Items] |  |
Indefinite-lived assets: | 175.5 | 175.3
Customer relationships |  |
Intangible Assets [Line Items] |  |
Cost | 1,245.7 | 1,239.7
Accumulated Amortization | (439.3) | (419.1)
Trade names |  |
Intangible Assets [Line Items] |  |
Cost | 189.3 | 189.0
Accumulated Amortization | (116.7) | (113.4)
Software |  |
Intangible Assets [Line Items] |  |
Cost | 67.5 | 66.5
Accumulated Amortization | (40.9) | (39.2)
Trade names |  |
Intangible Assets [Line Items] |  |
Cost | 54.0 | 53.9
Accumulated Amortization | $ (18.2) | $ (16.7)

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