Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Nov. 30, 2017	Nov. 30, 2016
Cash flows used in operating activities:
Net income (loss)	$ (12.0)	$ 21.6
Loss from discontinued operations	0.1	0.4
Income (Loss) from continuing operations	(11.9)	22.0
Adjustments to reconcile net income to net cash used in operating activities:
Asset impairments and other charges	54.2
Depreciation and intangible amortization	28.5	24.3
Stock-based compensation	5.4	4.9
Amortization of overhaul costs	4.7	10.6
Deferred tax provision (benefit)	(22.1)	(1.7)
Gain on asset disposal		(2.6)
Changes in certain assets and liabilities:
Accounts receivable	(3.3)	(29.7)
Inventories	(15.7)	(6.0)
Rotable spares and equipment on or available for short-term lease	2.5	5.1
Equipment supporting long-term programs	(28.4)	(47.9)
Accounts and trade notes payable	14.7	16.7
Accrued and other liabilities	(29.1)	7.3
Other, primarily program and overhaul costs	(8.2)	(3.3)
Net cash used in operating activities - continuing operations	(8.7)	(0.3)
Net cash used in operating activities - discontinued operations	(1.2)	(0.9)
Net cash used in operating activities	(9.9)	(1.2)
Cash flows used in investing activities:
Property, plant and equipment expenditures	(17.9)	(18.9)
Payments for acquisitions	(22.9)
Proceeds from aircraft joint ventures	7.3
Proceeds from asset disposals	1.3	18.0
Other	(0.6)	(2.8)
Net cash used in investing activities	(32.8)	(3.7)
Cash flows provided from (used in) financing activities:
Short-term borrowings, net	37.0	19.0
Reduction in long-term borrowings		(5.0)
Proceeds from long-term borrowings	24.8
Cash dividends	(5.2)	(5.2)
Purchase of treasury stock	(5.2)	(14.8)
Stock option exercises	9.2	3.9
Other	(1.1)	(0.7)
Net cash provided from (used in) financing activities	59.5	(2.8)
Effect of exchange rate changes on cash		(0.5)
Increase (Decrease) in cash and cash equivalents	16.8	(8.2)
Cash and cash equivalents, beginning of period	10.3	31.2
Cash and cash equivalents, end of period	$ 27.1	$ 23.0