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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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