CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Net sales	$ 1,797,600,000	$ 1,813,400,000	$ 2,226,700,000
Cost of sales	1,513,300,000	1,535,000,000	1,908,400,000
Cost of sales - excess inventory write-down	0	22,500,000	0
Gross profit	284,300,000	255,900,000	318,300,000
Selling, general and administrative expenses	183,900,000	173,800,000	177,700,000
Loss on divestiture of business	3,200,000	0	0
Restructuring and asset impairment charges	0	18,000,000	29,100,000
Goodwill impairment	0	12,500,000	0
Operating income	97,200,000	51,600,000	111,500,000
Interest expense	(29,800,000)	(28,000,000)	(27,700,000)
Other income (expense), net	2,800,000	(2,100,000)	5,300,000
Income before income taxes	70,200,000	21,500,000	89,100,000
Income tax expense	23,200,000	10,200,000	30,400,000
Net income	$ 47,000,000	$ 11,300,000	$ 58,700,000
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.99	$ 0.23	$ 1.11
Diluted (in dollars per share)	$ 0.99	$ 0.23	$ 1.11
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	47.0	48.1	52.6
Diluted (in shares)	47.1	48.2	52.7