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Earnings Per Common Share (Computation Of Basic And Diluted Earnings Per Common Share) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Common Share [Abstract]
Net income attributable to Carpenter	$ 33.0	$ 28.6	$ 80.3	$ 45.5
Less: earnings and dividends allocated to participating securities	(0.3)	(0.3)	(0.7)	(0.5)
Earnings available to Carpenter common stockholders	$ 32.7	$ 28.3	$ 79.6	$ 45.0
Weighted average number of common shares outstanding, basic	47.2	44.1	45.3	44.1
Effect of shares issuable under share based compensation plans	0.7	0.6	0.7	0.5
Weighted average number of common shares outstanding, diluted	47.9	44.7	46.0	44.6
Basic earnings per common share	$ 0.69	$ 0.64	$ 1.76	$ 1.02
Diluted earnings per common share	$ 0.69	$ 0.64	$ 1.75	$ 1.02

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