CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Shares Issued During Period, New Issues	84,547	1,448,520
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	$ (0.5)	$ (0.6)	$ (0.3)
Stock Issued During Period, Value, New Issues	$ 1.7	33.4
Purchase of noncontrolling interest, net		$ (1.8)
Common Stock
Common Stock, Shares, Outstanding	49,761,480	49,580,389	48,061,921	47,997,366
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	96,544	69,948	64,555
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	$ 0.0	$ 0.0	$ 0.0
Stock Issued During Period, Value, New Issues	0.1	1.4
Purchase of noncontrolling interest, net		0.0
Additional Paid-in Capital
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	(0.5)	(0.6)	(0.3)
Stock Issued During Period, Value, New Issues	1.6	32.0
Purchase of noncontrolling interest, net		(1.7)
Retained Earnings
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	0.0	0.0	0.0
Stock Issued During Period, Value, New Issues	0.0	0.0
Purchase of noncontrolling interest, net		0.0
Noncontrolling Interest
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	0.0	0.0	$ 0.0
Stock Issued During Period, Value, New Issues	$ 0.0	0.0
Purchase of noncontrolling interest, net		$ (0.1)