CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 2,157,700,000	$ 1,797,600,000	$ 1,813,400,000
Cost of sales	1,775,500,000	1,513,300,000	1,535,000,000
Cost of sales - excess inventory write-down	0	0	22,500,000
Gross profit	382,200,000	284,300,000	255,900,000
Selling, general and administrative expenses	195,100,000	183,900,000	173,800,000
Loss on divestiture of business	0	3,200,000	0
Restructuring and asset impairment charges	0	0	18,000,000
Goodwill impairment	0	0	12,500,000
Operating income	187,100,000	97,200,000	51,600,000
Interest expense	(28,300,000)	(29,800,000)	(28,000,000)
Other income (expense), net	1,400,000	2,800,000	(2,100,000)
Income before income taxes	160,200,000	70,200,000	21,500,000
Income tax (benefit) expense	(28,300,000)	23,200,000	10,200,000
Net income	$ 188,500,000	$ 47,000,000	$ 11,300,000
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 3.96	$ 0.99	$ 0.23
Diluted (in dollars per share)	$ 3.92	$ 0.99	$ 0.23
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	47.2	47.0	48.1
Diluted (in shares)	47.6	47.1	48.2