Consolidated Statements of Operations - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Income Statement [Abstract]
Revenues	$ 1,628.4	$ 1,741.6	$ 1,672.8
Operating costs and expenses:
Cost of goods sold	744.6	814.5	762.3
Selling, general and administrative expenses	763.2	777.5	773.6
Depreciation and amortization	43.9	38.7	38.9
Severance	9.9	14.9	11.9
Asset impairments	11.2	6.8	14.4
Total operating costs and expenses	1,572.8	1,652.4	1,601.1
Operating income	55.6	89.2	71.7
Interest income	3.1	1.4	1.1
Interest expense	(2.0)	(2.4)	(2.2)
Other components of net periodic benefit (cost)	(58.2)	(0.3)	(4.1)
Gain (loss) on investments and other	0.0	0.0	(2.2)
Earnings (loss) from continuing operations before income taxes	(1.5)	87.9	68.7
Provision (benefit) for income taxes	3.5	35.4	24.7
Earnings (loss) from continuing operations	(5.0)	52.5	44.0
Earnings (loss) from discontinued operations, net of tax	0.0	(0.2)	(3.5)
Net income (loss)	$ (5.0)	$ 52.3	$ 40.5
Basic:
Earnings (loss) from continuing operations (in Dollars per share)	$ (0.14)	$ 1.51	$ 1.29
Earnings (loss) from discontinued operations (in Dollars per share)	0.00	0.00	(0.11)
Net income (loss) (in Dollars per share)	(0.14)	1.51	1.18
Diluted:
Earnings (loss) from continuing operations (in Dollars per share)	(0.14)	1.48	1.26
Earnings (loss) from discontinued operations (in Dollars per share)	0.00	(0.01)	(0.10)
Net income (loss) (in Dollars per share)	(0.14)	1.47	1.16
Dividends declared per common share (in Dollars per share)	$ 0.6	$ 0.6	$ 0.6