Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Net service revenues	$ 738.8	$ 766.0	$ 2,038.4	$ 2,072.3
Cost of services provided	561.2	567.4	1,575.0	1,579.0
Gross profit	177.6	198.6	463.4	493.3
Selling, general and administrative expense	120.1	136.6	375.0	413.0
Gain on divestiture	(0.1)	0.0	(44.0)	0.0
Amortization expense	8.6	10.8	27.4	33.7
Income from operations	49.0	51.2	105.0	46.6
Other expense (income)	0.5	(0.6)	(1.5)	(2.1)
Interest expense, net	15.1	27.4	48.2	78.3
Income (loss) before income taxes	33.4	24.4	58.3	(29.6)
Income tax expense (benefit)	9.9	7.6	17.5	(5.5)
Net income (loss)	23.5	16.8	40.8	(24.1)
Less: dividends on Series A convertible preferred shares	8.9	0.0	26.7	0.0
Net income (loss) attributable to common stockholders	$ 14.6	$ 16.8	$ 14.1	$ (24.1)
Earnings (loss) per share:
Basic earnings (loss) per share	$ 0.1	$ 0.18	$ 0.09	$ (0.26)
Diluted earnings (loss) per share	$ 0.1	$ 0.18	$ 0.09	$ (0.26)