CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 427.4	$ 443.8	$ 816.3	$ 899.4
Cost of sales	364.9	377.5	707.8	764.5
Gross profit	62.5	66.3	108.5	134.9
Selling, general and administrative expenses	47.1	44.5	91.7	87.8
Restructuring charges	0.0	0.0	0.0	0.4
Operating income	15.4	21.8	16.8	46.7
Interest expense	(7.4)	(7.0)	(14.8)	(13.6)
Other income (expense), net	0.3	0.3	1.0	(1.9)
Income before income taxes	8.3	15.1	3.0	31.2
Income tax expense	1.3	3.6	2.2	10.8
Net income	$ 7.0	$ 11.5	$ 0.8	$ 20.4
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.15	$ 0.23	$ 0.01	$ 0.41
Diluted (in dollars per share)	$ 0.15	$ 0.23	$ 0.01	$ 0.41
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	47.0	48.8	47.0	49.3
Diluted (in shares)	47.1	48.9	47.1	49.4
Cash dividends per common share (in dollars per share)	$ 0.18	$ 0.18	$ 0.36	$ 0.36