Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Cash flows from operating activities
Net income (loss)	$ 105.7	$ (108.8)
Income from discontinued operations, net of taxes	0.0	(0.1)
Income (loss) from continuing operations	105.7	(108.9)
Adjustments to reconcile income (loss) from continuing operations to net cash provided by operating activities of continuing operations
Depreciation and amortization	44.3	49.1
Impairment loss	0.0	172.8
Deferred income taxes	(23.0)	(12.7)
Share-based compensation expense	17.6	4.2
Provision for bad debt	1.2	10.6
Amortization of accumulated other comprehensive gain on interest rate swaps	(3.2)	(3.4)
Discount accretion on insurance claims	0.0	0.4
Loss on sale of assets	1.1	0.4
Income from unconsolidated affiliates	(0.8)	(1.8)
Distributions from unconsolidated affiliates	0.0	0.1
Changes in operating assets and liabilities
Trade accounts receivable and costs incurred in excess of amounts billed	(10.9)	55.2
Prepaid expenses and other current assets	(5.8)	(12.8)
Right-of-use assets	11.2	8.7
Other noncurrent assets	15.2	(3.8)
Trade accounts payable and other accrued liabilities	55.3	(74.6)
Long-term lease liabilities	(10.0)	(9.4)
Insurance claims	(2.4)	17.7
Income taxes payable	11.5	25.1
Other noncurrent liabilities	(36.0)	11.1
Total adjustments	65.5	236.8
Net cash provided by operating activities of continuing operations	171.2	127.8
Net cash provided by operating activities of discontinued operations	0.0	0.1
Net cash provided by operating activities	171.2	128.0
Cash flows from investing activities
Additions to property, plant and equipment	(14.9)	(19.1)
Proceeds from sale of assets	1.5	4.8
Proceeds from redemption of auction rate security	0.0	5.0
Net cash used in investing activities	(13.4)	(9.3)
Cash flows from financing activities
Taxes withheld from issuance of share-based compensation awards, net	(5.6)	(1.4)
Repurchases of common stock	0.0	(5.1)
Dividends paid	(25.4)	(24.6)
Borrowings from credit facility	2.6	1,048.3
Repayment of borrowings from credit facility	(82.8)	(658.1)
Changes in book cash overdrafts	(13.3)	18.2
Financing of energy savings performance contracts	7.5	1.1
Repayment of finance lease obligations	(1.5)	(1.5)
Net cash (used in) provided by financing activities	(118.5)	376.8
Effect of exchange rate changes on cash and cash equivalents	2.2	2.0
Net increase in cash and cash equivalents	41.5	497.5
Cash and cash equivalents at beginning of year	394.2	58.5
Cash and cash equivalents at end of period	$ 435.7	$ 555.9