Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed - Verve (Details) - USD ($) $ in Millions	Nov. 01, 2023	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Business Combination [Line Items]
Goodwill		$ 3,839.0	$ 3,993.0	$ 3,529.0
Verve Industrial Protection
Business Combination [Line Items]
Receivables	$ 8.0
Goodwill	133.0
Intangible assets	47.0
All other assets	1.0
Total assets acquired	189.0
Less: Deferred income taxes	(6.0)
Net assets acquired	183.0
Total purchase consideration, net of cash acquired	$ 183.0