Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net (loss) income		$ (41.6)	$ 44.4	$ (15.1)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation		80.5	80.1	75.3
Amortization of intangible assets		55.8	56.3	104.9
Amortization of financing costs and original issue discount		3.7	3.7	10.4
Loss on debt extinguishment	[1]			25.1
Deferred taxes		(27.1)	(2.3)	(63.4)
Equity-based compensation		23.6	15.7	28.8
Realized loss on hedges		19.3	7.0	9.8
Goodwill impairment		15.5
Other non-cash activities, net		6.1	(0.3)	1.5
Change in operating assets and liabilities:
Accounts receivable		18.6	(12.8)	25.2
Unbilled and deferred revenue		21.2	(34.8)	2.6
Inventories		0.7	(2.4)	1.7
Other operating assets		(5.2)	17.1	(16.5)
Accounts payable and other operating liabilities		74.0	(2.0)	(9.9)
Net cash provided by operating activities		245.1	169.7	180.4
Cash flows from investing activities:
Purchase of property and equipment		(52.7)	(89.9)	(86.4)
Proceeds from sale of property and equipment		4.8	6.8	12.0
Business acquisitions, net of cash acquired		(90.3)	(64.0)	(104.4)
Proceeds from divestitures		28.5
Other investing activities, net		0.9	1.6	(0.5)
Net cash used in investing activities		(108.8)	(145.5)	(179.3)
Cash flows from financing activities:
Repayments of finance lease obligations		(9.9)	(5.8)	(6.3)
Repayments of term loan		(10.4)	(13.0)	(1,493.9)
Repayments of receivables financing agreement		(80.0)	(120.0)	(108.7)
Repayments of revolving credit facility		(70.0)	(10.0)	(60.0)
Proceeds from term loan, net of financing costs				1,016.9
Proceeds from receivables financing agreement		80.0	120.0	115.0
Proceeds from revolving credit facility		70.0	10.0	60.0
Proceeds from issuance of common stock, net of share issuance costs		1.8		501.2
Repurchase of common stock and distributions		(1.5)	(1.2)	(2.9)
Other financing activities, net		1.7	(0.3)
Net cash (used in) provided by financing activities		(18.3)	(20.3)	21.3
Net change in cash and cash equivalents		118.0	3.9	22.4
Cash and cash equivalents, beginning of period		39.1	35.2	12.8
Cash and cash equivalents, end of period		157.1	39.1	35.2
Supplemental Cash Flow Information:
Cash paid for income taxes, net		8.6	1.9	16.2
Cash paid for interest		$ 61.4	$ 71.7	$ 84.3

[1] Represents losses on the extinguishment of debt.