CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Income Statement [Abstract]
Revenues	$ 598.3	$ 623.1	$ 787.5	$ 905.8
Operating costs and expenses:
Cost of goods sold	253.6	271.3	369.2	441.0
Selling, general and administrative expenses	227.0	230.1	385.8	396.1
Depreciation and amortization	10.5	9.6	20.4	19.1
Asset impairments	0.0	0.0	6.7	0.0
Total operating costs and expenses	491.1	511.0	782.1	856.2
Operating income (loss)	107.2	112.1	5.4	49.6
Interest income (expense), net	0.0	(0.4)	0.3	(0.7)
Other components of net periodic benefit (cost)	(15.5)	(0.7)	(15.6)	(1.3)
Earnings (loss) from continuing operations before income taxes	91.7	111.0	(9.9)	47.6
Provision (benefit) for income taxes	34.6	43.1	(3.3)	19.2
Earnings (loss) from continuing operations	57.1	67.9	(6.6)	28.4
Earnings (loss) from discontinued operations, net of tax	0.0	0.0	0.0	(0.1)
Net income (loss)	$ 57.1	$ 67.9	$ (6.6)	$ 28.3
Basic:
Earnings (loss) from continuing operations (in Dollars per share)	$ 1.63	$ 1.96	$ (0.19)	$ 0.82
Earnings (loss) from discontinued operations, net of tax (in Dollars per share)	0.00	0.00	0.00	0.00
Net income (loss) (in Dollars per share)	1.63	1.96	(0.19)	0.82
Diluted:
Earnings (loss) from continuing operations (in Dollars per share)	1.60	1.92	(0.19)	0.81
Earnings (loss) from discontinued operations, net of tax (in Dollars per share)	0.00	0.00	0.00	(0.01)
Net income (loss) (in Dollars per share)	1.60	1.92	(0.19)	0.80
Dividends declared per class A and common share (in Dollars per share)	$ 0.15	$ 0.15	$ 0.3	$ 0.30