CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2023	Oct. 31, 2022	Oct. 31, 2021
Cash flows from operating activities
Net income	$ 251.3	$ 230.4	$ 126.3
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	120.7	112.4	89.9
Impairment loss on fixed assets	0.0	0.0	9.1
Deferred income taxes	(4.9)	67.7	(48.0)
Share-based compensation expense	30.5	30.5	33.5
Provision for/(Recovery of) bad debt	3.0	(7.7)	0.6
Amortization of accumulated other comprehensive gain on interest rate swaps	0.0	(4.8)	(6.4)
Discount accretion on insurance claims	0.4	0.1	0.1
(Gain)/Loss on sale of assets	(0.1)	(0.8)	0.2
Income from unconsolidated affiliates	(3.9)	(2.4)	(2.1)
Distributions from unconsolidated affiliates	1.9	1.9	1.9
Change in fair value of contingent consideration	(45.6)	0.0	0.0
Changes in operating assets and liabilities, net of effects of acquisitions
Trade accounts receivable and costs incurred in excess of amounts billed	(152.7)	(143.8)	(124.5)
Prepaid expenses and other current assets	(7.4)	19.7	6.8
Right-of-use assets	1.8	14.7	19.3
Other noncurrent assets	33.8	(21.2)	13.8
Trade accounts payable and other accrued liabilities	(3.8)	(143.0)	265.7
Long-term lease liabilities	(5.7)	(15.2)	(16.3)
Insurance claims	5.0	(17.4)	(28.4)
Income taxes payable	15.1	(31.8)	8.3
Other noncurrent liabilities	3.8	(69.0)	(35.4)
Total adjustments	(8.0)	(210.0)	188.0
Net cash provided by operating activities	243.3	20.4	314.3
Cash flows from investing activities
Additions to property, plant and equipment	(52.6)	(50.8)	(34.3)
Proceeds from sale of assets	2.9	6.0	4.4
Investments in equity securities	(12.4)	(2.1)	0.0
Purchase of business, net of cash acquired	0.0	(194.6)	(710.2)
Net cash used in investing activities	(62.1)	(241.5)	(740.0)
Cash flows from financing activities
Taxes withheld from issuance of share-based compensation awards, net	(10.5)	(9.9)	(8.1)
Repurchases of common stock, including excise taxes	(138.1)	(97.5)	0.0
Dividends paid	(57.5)	(51.9)	(51.0)
Deferred financing costs paid	0.0	0.0	(6.4)
Borrowings from debt	1,178.5	1,479.4	357.7
Repayment of borrowings from debt	(1,136.0)	(1,096.9)	(194.2)
Changes in book cash overdrafts	(20.3)	4.3	(17.9)
Financing of energy savings performance contracts	0.5	9.9	15.1
Repayment of finance lease obligations	(3.0)	(1.9)	(2.8)
Net cash (used in) provided by financing activities	(186.3)	235.5	92.4
Effect of exchange rate changes on cash and cash equivalents	1.6	(4.2)	1.9
Net (decrease) increase in cash and cash equivalents	(3.5)	10.2	(331.4)
Cash and cash equivalents at beginning of year	73.0	62.8	394.2
Cash and cash equivalents at end of year	69.5	73.0	62.8
Supplemental cash flow information
Income tax payments, net	69.1	46.4	93.5
Interest paid on credit facility	$ 89.4	$ 28.9	$ 14.3