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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Less: Tax effect	$ 23.9	$ 30.7
Net income (loss)	(39.6)	(49.4)
Amount reclassified from Accumulated other comprehensive income (loss) | Retirement benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of prior service cost (credit)	0.0	0.0
Amortization of unrecognized gain (loss) included in net periodic cost (credit)	1.0	1.0
Less: Tax effect	(0.3)	(0.3)
Net income (loss)	$ 0.7	$ 0.7

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

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