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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 52.3	$ 40.5	$ 294.6
Other comprehensive income (loss), net:
Foreign currency translation adjustments	(5.3)	(8.1)	(15.3)
Pension and post-retirement adjustments:
Amortization of prior service credit	0.0	0.0	(0.2)
Net actuarial gain (loss) associated with benefit plans	(2.2)	(1.6)	(6.3)
Total other comprehensive income (loss)	(7.5)	(9.7)	(21.8)
Comprehensive income (loss)	$ 44.8	$ 30.8	$ 272.8

X

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

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