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Goodwill and Other Intangibles (Details) - Schedule of activity in goodwill - USD ($) $ in Millions	12 Months Ended
	May. 31, 2015	May. 31, 2014
Goodwill [Roll Forward]
Gross beginning balance	$ 156.0	$ 156.0
Accumulated impairment	(34.2)	(20.8)
Beginning balance	121.8	135.2
Goodwill impairment	(5.4)	(13.4)
Foreign currency translation	(0.1)	0.0
Gross ending balance	155.9	156.0
Accumulated impairment	(39.6)	(34.2)
Ending balance	$ 116.3	$ 121.8

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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