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Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed - Cubic (Details) - USD ($) $ in Millions	Feb. 28, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Goodwill		$ 3,993.3	$ 3,529.2	$ 3,524.0
Cubic
Business Acquisition [Line Items]
Receivables	$ 23.8
Inventories	17.7
Property	27.5
Goodwill	111.3
Intangible assets	54.1
All other assets	21.0
Total assets acquired	255.4
Less: Other liabilities assumed	(12.6)
Less: Liabilities assumed	(56.6)
Net assets acquired, excluding cash	186.2
Total purchase consideration, net of cash acquired	$ 186.2