Segment Information, Geographic and Product Data (Details 4) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Product Data
Net sales	$ 611.8	$ 581.4	$ 533.5	$ 544.9	$ 643.7	$ 539.9	$ 431.1	$ 414.1	$ 2,271.7	$ 2,028.7	$ 1,675.1
Special alloys
Product Data
Net sales									989.9	931.4	831.8
Stainless steel
Product Data
Net sales									638.8	637.3	564.9
Titanium products
Product Data
Net sales									155.0	156.6	135.3
Powder metals
Product Data
Net sales									60.4	64.3	61.4
Alloy and tool steel
Product Data
Net sales									255.7	108.6	27.2
Other materials
Product Data
Net sales									$ 171.9	$ 130.5	$ 54.5