Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		1 Months Ended
	Oct. 31, 2022	Feb. 28, 2023	Jun. 30, 2023	Sep. 30, 2022
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill			$ 3,700.9	$ 3,524.0
CUBIC
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Receivables	$ 20.2
Inventories	17.7
Property	27.5
Goodwill	66.3
Other intangible assets	36.4
All other assets	9.2
Total assets acquired	177.3
Less: Total liabilities assumed	(43.5)
Net assets acquired, excluding cash	133.8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Total purchase consideration, net of cash acquired	$ 133.8
Knowledge Lens
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Receivables		$ 3.6
Goodwill		35.2
Other intangible assets		17.7
All other assets		3.5
Total assets acquired		60.0
Less: Total liabilities assumed		(8.0)
Net assets acquired, excluding cash		52.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract]
Total purchase consideration, net of cash acquired		$ 52.0