Segment Information, Geographic and Product Data (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Product Data
Net sales	$ 643.7	$ 539.9	$ 431.1	$ 414.1	$ 483.6	$ 464.2	$ 375.6	$ 351.7	$ 2,028.7	$ 1,675.1	$ 1,198.6
Special alloys
Product Data
Net sales									931.4	831.8	611.6
Stainless steel
Product Data
Net sales									637.3	564.9	373.4
Titanium products
Product Data
Net sales									156.6	135.3	108.0
Powder metals
Product Data
Net sales									64.3	61.4	33.8
Alloy and tool steel
Product Data
Net sales									108.6	27.2	29.9
Other materials
Product Data
Net sales									$ 130.5	$ 54.5	$ 41.9