Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net service revenues	$ 2,346.0	$ 2,404.6	$ 2,353.6
Cost of services provided	1,750.7	1,766.4	1,727.5
Gross profit	595.3	638.2	626.1
Selling, general and administrative expense	527.4	452.2	481.2
Amortization expense	55.8	56.3	104.9
Income from operations	12.1	129.7	40.0
Other income (expense)	1.3		(23.5)
Interest expense	64.6	72.5	97.8
(Loss) income before income taxes	(51.2)	57.2	(81.3)
Income tax benefit (expense)	9.6	(12.8)	66.2
Net (loss) income	$ (41.6)	$ 44.4	$ (15.1)
(Loss) income per share:
Basic and Diluted	$ (0.40)	$ 0.43	$ (0.18)