Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Net service revenues	$ 747.4	$ 673.6	$ 2,051.2	$ 1,879.9
Cost of services provided	558.2	494.6	1,565.0	1,409.2
Gross profit	189.2	179.0	486.2	470.7
Selling, general and administrative expense	131.3	123.1	399.5	374.4
Amortization expense	13.2	12.6	38.7	39.0
Income from operations	44.7	43.3	48.0	57.3
Other (expense) income	(14.6)	0.8	(15.1)	2.8
Interest expense	14.8	9.4	34.5	32.5
Income (loss) before income taxes	15.3	34.7	(1.6)	27.6
Income tax expense (benefit)	4.5	9.5	(0.3)	8.1
Net income (loss)	$ 10.8	$ 25.2	$ (1.3)	$ 19.5
Income (loss) per share:
Basic income (loss) per share	$ 0.12	$ 0.24	$ (0.01)	$ 0.19
Diluted income (loss) per share	$ 0.12	$ 0.24	$ (0.01)	$ 0.18