Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 69.1	$ 76.6
Other comprehensive gain, net of tax:
Foreign currency translation adjustment	6.9	8.2
Cash flow hedges	20.7	14.7
Total other comprehensive gain, net of tax	27.6	22.9
Comprehensive income	$ 96.7	$ 99.5