CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income	$ 132.8	$ 146.5	$ 121.6
Other comprehensive income (loss), net of tax
Pension and post-retirement benefits gain (loss), net of tax of $(22.1), $(48.3), and $78.5, respectively	36.9	80.5	(126.4)
Net gain (loss) on derivative instruments, net of tax of $(29.5), $5.3, and $21.6, respectively	49.1	(8.7)	(35.4)
Unrealized gain (loss) on marketable securities, net of tax of $0.0, $(0.2), and $0.1, respectively		0.3	(0.2)
Foreign currency translation	4.5	5.0	(18.6)
Other comprehensive income (loss), net of tax	90.5	77.1	(180.6)
Comprehensive income (loss), net of tax	223.3	223.6	(59.0)
Less: Comprehensive income (loss) attributable to the noncontrolling interest		0.7	(1.0)
Comprehensive income (loss) attributable to Carpenter	$ 223.3	$ 222.9	$ (58.0)