CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 473.6	$ 456.3	$ 1,289.9	$ 1,355.7
Cost of sales	390.5	386.3	1,098.3	1,150.8
Cost of sales - excess inventory write-down	0.0	22.5	0.0	22.5
Gross profit	83.1	47.5	191.6	182.4
Selling, general and administrative expenses	47.3	41.7	139.0	129.5
Restructuring and asset impairment charges	0.0	17.6	0.0	18.0
Goodwill impairment	0.0	12.5	0.0	12.5
Operating income (loss)	35.8	(24.3)	52.6	22.4
Interest expense	(7.7)	(7.2)	(22.5)	(20.8)
Other income (expense), net	1.0	(1.5)	2.0	(3.4)
Income (loss) before income taxes	29.1	(33.0)	32.1	(1.8)
Income tax expense (benefit)	8.4	(9.1)	10.6	1.8
Net income (loss)	$ 20.7	$ (23.9)	$ 21.5	$ (3.6)
EARNINGS (LOSS) PER COMMON SHARE:
Basic (in dollars per share)	$ 0.44	$ (0.51)	$ 0.45	$ (0.08)
Diluted (in dollars per share)	$ 0.44	$ (0.51)	$ 0.45	$ (0.08)
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	47.0	47.1	47.0	48.5
Diluted (in shares)	47.1	47.1	47.1	48.5
Cash dividends per common share (in dollars per share)	$ 0.18	$ 0.18	$ 0.54	$ 0.54