Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Net service revenues	$ 672.9	$ 650.4	$ 1,299.6	$ 1,306.3
Cost of services provided	520.9	503.3	1,013.7	1,011.6
Gross profit	152.0	147.1	285.9	294.7
Selling, general and administrative expense	125.0	138.7	255.0	276.4
(Gain) on divestiture	(43.9)	0.0	(43.9)	0.0
Amortization expense	8.7	11.0	18.8	22.9
Income (loss) from operations	62.2	(2.6)	56.0	(4.6)
Other (income)	(0.8)	(0.6)	(1.9)	(1.4)
Interest expense, net	16.0	27.7	33.0	50.9
Income (loss) before income taxes	47.0	(29.7)	24.9	(54.1)
Income tax expense (benefit)	13.3	(7.7)	7.6	(13.2)
Net income (loss)	33.7	(22.0)	17.3	(40.9)
Less: dividends on Series A convertible preferred shares	8.9	0.0	17.8	0.0
Net income (loss) attributable to common stockholders	$ 24.8	$ (22.0)	$ (0.5)	$ (40.9)
Earnings (loss) per share:
Basic earnings (loss) per share	$ 0.17	$ (0.23)	$ (0.01)	$ (0.44)
Diluted earnings (loss) per share	$ 0.17	$ (0.23)	$ (0.01)	$ (0.44)