Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Net service revenues	$ 2,767.1	$ 2,816.0	$ 2,774.6
Cost of services provided	2,121.5	2,137.1	2,099.8
Gross profit	645.6	678.9	674.8
Selling, general and administrative expense	496.5	533.4	534.9
Gain on divestiture	(43.6)	0.0	0.0
Amortization expense	35.8	44.5	51.5
Income from operations	156.9	101.0	88.4
Other (income) expense	(2.0)	6.7	15.5
Interest expense, net	62.4	97.4	53.3
Income (loss) before income taxes	96.5	(3.1)	19.6
Income tax expense	30.1	4.6	5.6
Net income (loss)	66.4	(7.7)	14.0
Less: dividends on Series A convertible preferred shares	35.7	3.2	0.0
Net income (loss) attributable to common stockholders	$ 30.7	$ (10.9)	$ 14.0
Earnings (loss) per share:
Basic earnings (loss) per share	$ 0.21	$ (0.12)	$ 0.14
Diluted earnings (loss) per share	$ 0.2	$ (0.12)	$ 0.14