Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Condensed Consolidated Statement of Other Comprehensive Income (Loss) [Abstract]
Net income	$ 16.3	$ 18.2
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustment	0.7	0.3
Other comprehensive income	0.7	0.3
Comprehensive income	$ 17.0	$ 18.5