Fair Value Measurements (Tables)

12 Months Ended

May. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value Measurements

The following tables present non-financial assets that were measured and recognized at fair value on a non-recurring basis and the total impairment losses and additions recognized on those assets:

	Net carrying value as of	Fair value measured and recognized using			Impairment losses for fiscal year ended	Additions due to other investments and acquisitions
	May 31, 2015	Level 1	Level 2	Level 3	May 31, 2015
Property, plant and equipment, net	—	—	—	—	7.5	—
Goodwill	—	—	—	—	5.4	—
Production assets	—	—	—	—	2.9	—

	Net carrying value as of		Fair value measured and recognized using						Impairment losses for fiscal year ended		Additions due to other investments and acquisitions
	May 31, 2014		Level 1		Level 2		Level 3		May 31, 2014
Investments	$	—	$	—	$	—	$	—	$	5.8	$	1.0
Property, plant and equipment, net	—		—		—		—		7.6		—
Goodwill	—		—		—		—		13.4		—
Prepublication assets	—		—		—		—		5.7		—

	Net carrying value as of	Fair value measured and recognized using			Impairment losses for fiscal year ended
	May 31, 2013	Level 1	Level 2	Level 3	May 31, 2013	Additions due to acquisitions
Other intangible assets	0.3	—	—	0.3	—	0.3
Property, plant and equipment, net	—	—	—	—	5.2	—
Prepublication assets	—	—	—	—	2.0	—