CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2020
Cash flows from operating activities
Net income	$ 230.4	$ 126.3	$ 0.3
Income from discontinued operations, net of taxes	0.0	0.0	(0.1)
Income from continuing operations	230.4	126.3	0.2
Adjustments to reconcile income from continuing operations to net cash provided by operating activities of continuing operations
Depreciation and amortization	112.4	89.9	96.4
Impairment loss of goodwill and other intangibles	0.0	0.0	172.8
Impairment loss on fixed assets	0.0	9.1	0.0
Deferred income taxes	67.7	(48.0)	(36.6)
Share-based compensation expense	30.5	33.5	20.3
(Recovery of)/Provision for bad debt	(7.7)	0.6	19.6
Amortization of accumulated other comprehensive gain on interest rate swaps	(4.8)	(6.4)	(6.7)
Discount accretion on insurance claims	0.1	0.1	0.8
(Gain)/Loss on sale of assets	(0.8)	0.2	2.1
Reserves on other assets	0.0	0.0	17.6
Income from unconsolidated affiliates	(2.4)	(2.1)	(2.2)
Distributions from unconsolidated affiliates	1.9	1.9	0.1
Changes in operating assets and liabilities, net of effects of acquisitions
Trade accounts receivable and costs incurred in excess of amounts billed	(143.8)	(124.5)	141.4
Prepaid expenses and other current assets	19.7	6.8	(15.5)
Right-of-use assets	14.7	19.3	24.4
Other noncurrent assets	(21.2)	13.8	(10.4)
Trade accounts payable and other accrued liabilities	(143.0)	265.7	(53.5)
Long-term lease liabilities	(15.2)	(16.3)	(22.9)
Insurance claims	(17.4)	(28.4)	5.7
Income taxes payable	(31.8)	8.3	7.6
Other noncurrent liabilities	(69.0)	(35.4)	96.2
Total adjustments	(210.0)	188.0	457.2
Net cash provided by operating activities of continuing operations	20.4	314.3	457.4
Net cash provided by operating activities of discontinued operations	0.0	0.0	0.1
Net cash provided by operating activities	20.4	314.3	457.5
Cash flows from investing activities
Additions to property, plant and equipment	(50.8)	(34.3)	(38.0)
Proceeds from sale of assets	6.0	4.4	5.5
Proceeds from redemption of auction rate security	0.0	0.0	5.0
Investments in equity securities	(2.1)	0.0	0.0
Purchase of business, net of cash acquired	(194.6)	(710.2)	0.0
Net cash used in investing activities	(241.5)	(740.0)	(27.5)
Cash flows from financing activities
Taxes withheld from issuance of share-based compensation awards, net	(9.9)	(8.1)	(0.9)
Repurchases of common stock	(97.5)	0.0	(5.1)
Dividends paid	(51.9)	(51.0)	(49.3)
Deferred financing costs paid	0.0	(6.4)	(4.4)
Borrowings from debt	1,479.4	357.7	1,058.5
Repayment of borrowings from debt	(1,096.9)	(194.2)	(1,141.6)
Changes in book cash overdrafts	4.3	(17.9)	41.2
Financing of energy savings performance contracts	9.9	15.1	11.1
Repayment of finance lease obligations	(1.9)	(2.8)	(3.4)
Net cash provided by (used in) financing activities	235.5	92.4	(94.1)
Effect of exchange rate changes on cash and cash equivalents	(4.2)	1.9	(0.2)
Net increase (decrease) in cash and cash equivalents	10.2	(331.4)	335.7
Cash and cash equivalents at beginning of year	62.8	394.2	58.5
Cash and cash equivalents at end of year	73.0	62.8	394.2
Supplemental cash flow information
Income tax payments, net	46.4	93.5	82.2
Interest paid on credit facility	$ 28.9	$ 14.3	$ 32.9