Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Net service revenues	$ 708.3	$ 738.8	$ 1,970.0	$ 2,038.4
Cost of services provided	537.4	561.2	1,524.8	1,575.0
Gross profit	170.9	177.6	445.2	463.4
Selling, general and administrative expense	106.2	120.1	343.5	375.0
Gain on divestiture	0.0	(0.1)	0.0	(44.0)
Amortization expense	7.1	8.6	22.3	27.4
Income from operations	57.6	49.0	79.4	105.0
Other (income) expense	(0.7)	0.5	0.1	(1.5)
Interest expense, net	13.4	15.1	40.3	48.2
Income before income taxes	44.9	33.4	39.0	58.3
Income tax expense	12.6	9.9	10.7	17.5
Net income	32.3	23.5	28.3	40.8
Less: Dividends on Series A convertible preferred shares	8.9	8.9	26.8	26.7
Net income attributable to common stockholders	$ 23.4	$ 14.6	$ 1.5	$ 14.1
Earnings per share
Basic earnings per share	$ 0.16	$ 0.1	$ 0.01	$ 0.09
Diluted earnings per share	$ 0.15	$ 0.1	$ 0.01	$ 0.09