Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net service revenues	$ 2,672.8	$ 2,767.1	$ 2,816.0
Cost of services provided	2,051.1	2,121.5	2,137.1
Gross profit	621.7	645.6	678.9
Selling, general and administrative expense	457.8	496.5	533.4
Gain on divestiture	0.0	(43.6)	0.0
Amortization expense	29.3	35.8	44.5
Income from operations	134.6	156.9	101.0
Other (income) expense	(0.4)	(2.0)	6.7
Interest expense, net	53.7	62.4	97.4
Income (loss) before income taxes	81.3	96.5	(3.1)
Income tax expense	25.3	30.1	4.6
Net income	56.0	66.4	(7.7)
Less: dividends on Series A convertible preferred shares	35.8	35.7	3.2
Net income (loss) attributable to common stockholders	$ 20.2	$ 30.7	$ (10.9)
Earnings per share
Basic earnings per share	$ 0.13	$ 0.21	$ (0.12)
Diluted earnings per share	$ 0.13	$ 0.2	$ (0.12)