Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net service revenues	$ 559.1	$ 596.6	$ 1,129.8	$ 1,122.7
Cost of services provided	426.8	450.5	854.5	844.7
Gross profit	132.3	146.1	275.3	278.0
Selling, general and administrative expense	126.9	119.5	257.1	229.6
Amortization expense	13.6	13.8	27.1	28.9
(Loss) income from operations	(8.2)	12.8	(8.9)	19.5
Other (expense) income	(1.9)	1.2	(1.3)	(0.3)
Interest expense	17.1	18.9	34.5	36.1
(Loss) before income taxes	(27.2)	(4.9)	(44.7)	(16.9)
Income tax benefit	6.7	1.3	11.6	4.5
Net (loss)	$ (20.5)	$ (3.6)	$ (33.1)	$ (12.4)
(Loss) per share:
Basic and diluted	$ (0.20)	$ (0.04)	$ (0.32)	$ (0.12)