CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Net sales	$ 456.3	$ 570.6	$ 1,355.7	$ 1,668.8
Cost of sales	386.3	494.8	1,150.8	1,438.9
Cost of sales - excess inventory write-down	22.5	0.0	22.5	0.0
Gross profit	47.5	75.8	182.4	229.9
Selling, general and administrative expenses	41.7	45.7	129.5	132.7
Restructuring and asset impairment charges	17.6	25.3	18.0	25.3
Goodwill impairment	12.5	0.0	12.5	0.0
Operating (loss) income	(24.3)	4.8	22.4	71.9
Interest expense	(7.2)	(7.1)	(20.8)	(20.9)
Other (expense) income, net	(1.5)	0.0	(3.4)	4.8
(Loss) income before income taxes	(33.0)	(2.3)	(1.8)	55.8
Income tax (benefit) expense	(9.1)	(0.9)	1.8	19.6
Net (loss) income	$ (23.9)	$ (1.4)	$ (3.6)	$ 36.2
(LOSS) EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ (0.51)	$ (0.03)	$ (0.08)	$ 0.68
Diluted (in dollars per share)	$ (0.51)	$ (0.03)	$ (0.08)	$ 0.68
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	47.1	52.6	48.5	53.2
Diluted (in shares)	47.1	52.6	48.5	53.3
Cash dividends per common share (in dollars per share)	$ 0.18	$ 0.18	$ 0.54	$ 0.54