CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Income Statement [Abstract]
Revenues	$ 336.2	$ 366.0	$ 1,242.0	$ 1,159.0
Operating costs and expenses:
Cost of goods sold	160.3	178.0	601.3	549.6
Selling, general and administrative expenses (exclusive of depreciation and amortization)	190.0	188.3	587.4	563.0
Depreciation and amortization	9.5	9.2	28.6	30.3
Asset impairments	0.0	6.9	0.0	6.9
Total operating costs and expenses	359.8	382.4	1,217.3	1,149.8
Operating income (loss)	(23.6)	(16.4)	24.7	9.2
Interest income (expense), net	(0.3)	(0.2)	(1.0)	(0.8)
Gain (loss) on investments	0.0	0.0	0.0	2.2
Earnings (loss) from continuing operations before income taxes	(23.9)	(16.6)	23.7	10.6
Provision (benefit) for income taxes	(8.4)	(9.4)	10.8	1.5
Earnings (loss) from continuing operations	(15.5)	(7.2)	12.9	9.1
Earnings (loss) from discontinued operations, net of tax	0.1	(1.8)	0.0	(2.6)
Net income (loss)	$ (15.4)	$ (9.0)	$ 12.9	$ 6.5
Basic:
Earnings (loss) from continuing operations (in Dollars per share)	$ (0.45)	$ (0.21)	$ 0.37	$ 0.27
Earnings (loss) from discontinued operations, net of tax (in Dollars per share)	0.01	(0.05)	0.00	(0.08)
Net income (loss) (in Dollars per share)	(0.44)	(0.26)	0.37	0.19
Diluted:
Earnings (loss) from continuing operations (in Dollars per share)	(0.45)	(0.21)	0.36	0.26
Earnings (loss) from discontinued operations, net of tax (in Dollars per share)	0.01	(0.05)	0.00	(0.07)
Net income (loss) (in Dollars per share)	(0.44)	(0.26)	0.36	0.19
Dividends declared per class A and common share (in Dollars per share)	$ 0.15	$ 0.15	$ 0.45	$ 0.45