Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions		1 Months Ended
	Oct. 31, 2022	Feb. 28, 2023	Mar. 31, 2023	Sep. 30, 2022
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill			$ 3,685.2	$ 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	0.9
Total assets acquired	169.0
Less: Total liabilities assumed	(35.2)
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		35.7
Other intangible assets		17.7
All other assets		1.8
Total assets acquired		58.8
Less: Total liabilities assumed		(6.8)
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