Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net service revenues	$ 766.0	$ 747.4	$ 2,072.3	$ 2,051.2
Cost of services provided	567.4	558.2	1,579.0	1,565.0
Gross profit	198.6	189.2	493.3	486.2
Selling, general and administrative expense	136.6	131.3	413.0	399.5
Amortization expense	10.8	13.2	33.7	38.7
Income from operations	51.2	44.7	46.6	48.0
Other (income) expense	(0.6)	14.6	(2.1)	15.1
Interest expense	27.4	14.8	78.3	34.5
Income (loss) before income taxes	24.4	15.3	(29.6)	(1.6)
Income tax expense (benefit)	7.6	4.5	(5.5)	(0.3)
Net income (loss)	$ 16.8	$ 10.8	$ (24.1)	$ (1.3)
Earnings (loss) per share:
Basic (loss) earnings per share	$ 0.18	$ 0.12	$ (0.26)	$ (0.01)
Diluted (loss) earnings per share	$ 0.18	$ 0.12	$ (0.26)	$ (0.01)