Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2019
Cash flows from operating activities
Net income	$ 126.3	$ 0.3	$ 127.4
(Income) loss from discontinued operations, net of taxes	0.0	(0.1)	0.1
Income from continuing operations	126.3	0.2	127.5
Adjustments to reconcile income from continuing operations to net cash provided by operating activities of continuing operations
Depreciation and amortization	89.9	96.4	107.4
Impairment loss of goodwill and other intangibles	0.0	172.8	0.0
Impairment loss on fixed assets	9.1	0.0	0.0
Deferred income taxes	(48.0)	(36.6)	9.7
Share-based compensation expense	33.5	20.3	17.5
Provision for bad debt	0.6	19.6	6.7
Amortization of accumulated other comprehensive gain on interest rate swaps	(6.4)	(6.7)	(5.7)
Discount accretion on insurance claims	0.1	0.8	0.8
Loss (gain) on sale of assets	0.2	2.1	(0.6)
Reserves on other assets	0.0	17.6	0.0
Income from unconsolidated affiliates	(2.1)	(2.2)	(3.0)
Distributions from unconsolidated affiliates	1.9	0.1	5.4
Changes in operating assets and liabilities, net of effects of acquisitions
Trade accounts receivable and costs incurred in excess of amounts billed	(124.5)	141.4	(78.3)
Prepaid expenses and other current assets	6.8	(15.5)	(13.2)
Right-of-use assets	19.3	24.4	0.0
Other noncurrent assets	13.8	(10.4)	4.5
Trade accounts payable and other accrued liabilities	265.7	(53.5)	85.8
Long-term lease liabilities	(16.3)	(22.9)	0.0
Insurance claims	(28.4)	5.7	3.9
Income taxes payable	8.3	7.6	3.2
Other noncurrent liabilities	(35.4)	96.2	(8.7)
Total adjustments	188.0	457.2	135.3
Net cash provided by operating activities of continuing operations	314.3	457.4	262.8
Net cash provided by (used in) operating activities of discontinued operations	0.0	0.1	(0.1)
Net cash provided by operating activities	314.3	457.5	262.7
Cash flows from investing activities
Additions to property, plant and equipment	(34.3)	(38.0)	(59.6)
Proceeds from sale of assets	4.4	5.5	1.3
Proceeds from redemption of auction rate security	0.0	5.0	0.0
Purchase of business, net of cash acquired	(710.2)	0.0	0.0
Net cash used in investing activities	(740.0)	(27.5)	(58.3)
Cash flows from financing activities
Taxes withheld from issuance of share-based compensation awards, net	(8.1)	(0.9)	(1.3)
Repurchases of common stock	0.0	(5.1)	0.0
Dividends paid	(51.0)	(49.3)	(47.7)
Deferred financing costs paid	(6.4)	(4.4)	0.0
Borrowings from credit facility	357.7	1,058.5	1,755.9
Repayment of borrowings from credit facility	(194.2)	(1,141.6)	(1,896.5)
Changes in book cash overdrafts	(17.9)	41.2	(0.2)
Financing of energy savings performance contracts	15.1	11.1	8.1
Repayment of finance lease obligations	(2.8)	(3.4)	(3.1)
Net cash provided by (used in) financing activities	92.4	(94.1)	(184.8)
Effect of exchange rate changes on cash and cash equivalents	1.9	(0.2)	(0.2)
Net (decrease) increase in cash and cash equivalents	(331.4)	335.7	19.4
Cash and cash equivalents at beginning of year	394.2	58.5	39.1
Cash and cash equivalents at end of year	62.8	394.2	58.5
Supplemental cash flow information
Income tax payments, net	93.5	82.2	20.6
Interest paid on credit facility	$ 14.3	$ 32.9	$ 39.9