Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Net service revenues	$ 650.4	$ 711.9	$ 1,306.3	$ 1,303.8
Cost of services provided	503.3	554.8	1,011.6	1,006.8
Gross profit	147.1	157.1	294.7	297.0
Selling, general and administrative expense	138.7	133.4	276.4	268.2
Amortization expense	11.0	12.0	22.9	25.5
(Loss) income from operations	(2.6)	11.7	(4.6)	3.3
Other (income) expense	(0.6)	1.0	(1.4)	0.4
Interest expense	27.7	10.1	50.9	19.7
(Loss) income before income taxes	(29.7)	0.6	(54.1)	(16.8)
Income tax (benefit)	(7.7)	(0.1)	(13.2)	(4.7)
Net (loss) income	$ (22.0)	$ 0.7	$ (40.9)	$ (12.1)
(Loss) income per share:
Basic (loss) earnings per share	$ (0.23)	$ 0.01	$ (0.44)	$ (0.12)
Diluted (loss) earnings per share	$ (0.23)	$ 0.01	$ (0.44)	$ (0.12)