CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
Income Statement [Abstract]
Revenues	$ 344.7	$ 336.2	$ 1,132.2	$ 1,242.0
Operating costs and expenses:
Cost of goods sold	166.4	160.3	535.6	601.3
Selling, general and administrative expenses	186.2	191.1	572.0	587.2
Depreciation and amortization	11.5	9.5	31.9	28.6
Asset impairments	4.3	0.0	11.0	0.0
Total operating costs and expenses	368.4	360.9	1,150.5	1,217.1
Operating income (loss)	(23.7)	(24.7)	(18.3)	24.9
Interest income (expense), net	0.2	(0.3)	0.5	(1.0)
Other components of net periodic benefit (cost)	(39.8)	1.1	(55.4)	(0.2)
Earnings (loss) from continuing operations before income taxes	(63.3)	(23.9)	(73.2)	23.7
Provision (benefit) for income taxes	(14.1)	(8.4)	(17.4)	10.8
Earnings (loss) from continuing operations	(49.2)	(15.5)	(55.8)	12.9
Earnings (loss) from discontinued operations, net of tax	0.0	0.1	0.0	0.0
Net income (loss)	$ (49.2)	$ (15.4)	$ (55.8)	$ 12.9
Basic:
Earnings (loss) from continuing operations (in Dollars per share)	$ (1.41)	$ (0.45)	$ (1.59)	$ 0.37
Earnings (loss) from discontinued operations, net of tax (in Dollars per share)	0.00	0.01	0.00	0.00
Net income (loss) (in Dollars per share)	(1.41)	(0.44)	(1.59)	0.37
Diluted:
Earnings (loss) from continuing operations (in Dollars per share)	(1.41)	(0.45)	(1.59)	0.36
Earnings (loss) from discontinued operations, net of tax (in Dollars per share)	0.00	0.01	0.00	0.00
Net income (loss) (in Dollars per share)	(1.41)	(0.44)	(1.59)	0.36
Dividends declared per class A and common share (in Dollars per share)	$ 0.15	$ 0.15	$ 0.45	$ 0.45