Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 53.1	$ 41.7	$ 122.2	$ 118.3
Other comprehensive (loss)/gain, net of tax:
Foreign currency translation adjustment	(4.6)	3.2	2.3	11.4
Cash flow hedges	(0.8)	14.3	19.9	29.0
Total other comprehensive (loss)/gain, net of tax	(5.4)	17.5	22.2	40.4
Comprehensive income	$ 47.7	$ 59.2	$ 144.4	$ 158.7