Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 76.6	$ 41.7
Other comprehensive gain/(loss), net of tax:
Foreign currency translation adjustment	8.2	(1.3)
Cash flow hedges	14.7	(0.1)
Total other comprehensive gain/(loss), net of tax	22.9	(1.4)
Comprehensive income	$ 99.5	$ 40.3