CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
NET SALES	$ 2,226.7	$ 2,173.0	$ 2,271.7
Cost of sales	1,908.4	1,774.1	1,838.2
Gross profit	318.3	398.9	433.5
Selling, general and administrative expenses	177.7	186.9	200.8
Restructuring charges	29.1	0.0	0.0
Operating income	111.5	212.0	232.7
Interest expense	(27.7)	(17.0)	(21.0)
Other income, net	5.3	1.4	5.1
Income before income taxes	89.1	196.4	216.8
Income tax expense	30.4	63.6	70.3
Net income	58.7	132.8	146.5
Less: net income attributable to noncontrolling interest	0.0	0.0	(0.4)
NET INCOME ATTRIBUTABLE TO CARPENTER	$ 58.7	$ 132.8	$ 146.1
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 1.11	$ 2.48	$ 2.75
Diluted (in dollars per share)	$ 1.11	$ 2.47	$ 2.73
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	52.6	53.3	52.9
Diluted (in shares)	52.7	53.6	53.2