Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Income Statement [Abstract]
Revenues	$ 1,741.6	$ 1,672.8	$ 1,635.8
Operating costs and expenses:
Cost of goods sold	814.5	762.3	758.5
Selling, general and administrative expenses	777.8	777.7	771.1
Depreciation and amortization	38.7	38.9	47.9
Severance	14.9	11.9	9.6
Asset impairments	6.8	14.4	15.8
Total operating costs and expenses	1,652.7	1,605.2	1,602.9
Operating income	88.9	67.6	32.9
Interest income	1.4	1.1	0.3
Interest expense	(2.4)	(2.2)	(3.8)
Gain (loss) on investments and other	0.0	(2.2)	(0.5)
Earnings (loss) from continuing operations before income taxes	87.9	68.7	29.9
Provision (benefit) for income taxes	35.4	24.7	14.4
Earnings (loss) from continuing operations	52.5	44.0	15.5
Earnings (loss) from discontinued operations, net of tax	(0.2)	(3.5)	279.1
Net income (loss)	$ 52.3	$ 40.5	$ 294.6
Basic:
Earnings (loss) from continuing operations (in Dollars per share)	$ 1.51	$ 1.29	$ 0.47
Earnings (loss) from discontinued operations (in Dollars per share)	0.00	(0.11)	8.53
Net income (loss) (in Dollars per share)	1.51	1.18	9.00
Diluted:
Earnings (loss) from continuing operations (in Dollars per share)	1.48	1.26	0.46
Earnings (loss) from discontinued operations (in Dollars per share)	(0.01)	(0.10)	8.34
Net income (loss) (in Dollars per share)	1.47	1.16	8.80
Dividends declared per common share (in Dollars per share)	$ 0.6	$ 0.6	$ 0.6