Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Feb. 29, 2020	May 31, 2019
Condensed Consolidated Balance Sheets
Accounts receivable, allowances	$ 20.2	$ 16.0
Property, plant and equipment, accumulated depreciation	244.9	231.8
Intangible assets, accumulated amortization	$ 18.2	$ 30.3
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, authorized shares	250,000	250,000
Preferred stock, issued shares	0	0
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, authorized shares	100,000,000	100,000,000
Common stock, issued shares	45,300,786	45,300,786
Treasury stock, shares	10,200,090	10,512,974