Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income (loss)	$ 17.3	$ (40.9)
Adjustments to reconcile net (loss) to net cash provided by operating activities:
Depreciation	51.7	54.5
Amortization of intangible assets	18.8	22.9
Amortization of financing costs and original issue discount	1.3	1.8
Deferred taxes	(7.2)	(17.2)
Equity-based compensation	10.0	11.9
Realized (gain) loss on hedges	(5.6)	(4.3)
Gain on divestiture	(43.9)	0.0
Other non-cash activities, net	2.1	0.9
Change in operating assets and liabilities:
Accounts receivable	16.8	(17.2)
Unbilled and deferred revenue	67.4	37.5
Other operating assets	4.3	23.3
Accounts payable and other operating liabilities	(23.5)	(18.2)
Net cash provided by operating activities	109.5	55.0
Cash flows from investing activities:
Purchase of property and equipment	(22.7)	(42.7)
Proceeds from sale of property and equipment	2.6	3.6
Business acquisitions, net of cash acquired	0.0	(13.8)
Proceeds from divestiture	51.6	0.0
Other investing activities	0.8	1.1
Net cash provided (used) by investing activities	32.3	(51.8)
Cash flows from financing activities:
Repayments of finance lease obligations	(15.5)	(14.7)
Repayments of term loan	0.0	(6.0)
Repayments of receivables financing agreement	(9.5)	(279.5)
Repayments of revolving credit facility	0.0	(33.5)
Proceeds from receivables financing agreement, net of issuance costs	0.5	298.0
Proceeds from revolving credit facility	0.0	33.5
Debt issuance and prepayment costs	(0.4)	0.0
Proceeds from issuance of common stock, net of share issuance costs	0.6	0.7
Repurchase of common stock and distributions	(2.5)	(1.2)
Contingent business acquisition payments	(4.7)	(9.6)
Net cash (used) by financing activities	(31.5)	(12.3)
Net change in cash and cash equivalents	110.3	(9.1)
Cash and cash equivalents, beginning of period	67.0	20.1
Cash and cash equivalents, end of period	177.3	11.0
Supplemental Cash Flow Information
Cash (received) paid for income taxes, net	4.1	(21.8)
Cash paid for interest	35.3	37.2
Series A Preferred Stock [Member]
Supplemental Cash Flow Information
Non-cash Series A Preferred Stock dividends	$ 8.9	$ 0.0