Segment Information, Geographic and Product Data (Details 2) (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
Segment 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
Pension earnings, interest & deferrals									(15.3)	(35.2)	(38.0)
Operating income	66.5	55.7	43.9	44.0	35.0	35.2	12.1	14.1	210.1	96.4	11.7
Depreciation and amortization									83.8	66.5	59.1
Capital Expenditures									171.9	79.6	44.2
Assets	2,627.8				1,991.9				2,627.8	1,991.9
Specialty Alloys Operations
Segment Data
Net sales									1,566.6	1,431.3	1,017.6
Operating income									229.4	139.3	65.2
Depreciation and amortization									53.2	51.1	47.8
Capital Expenditures									121.1	51.6	38.1
Assets	1,293.3				1,186.2				1,293.3	1,186.2
Performance Engineered Products
Segment Data
Net sales									347.0	248.3	157.7
Operating income									41.7	35.0	17.1
Depreciation and amortization									17.7	10.2	5.5
Capital Expenditures									40.0	24.8	3.2
Assets	358.6				319.6				358.6	319.6
Latrobe
Segment Data
Net sales									217.7	38.7	32.6
Operating income									13.3	2.2	0.7
Depreciation and amortization									7.7	0.4	0.3
Capital Expenditures									7.6	0.4	0.2
Assets	843.1				29.9				843.1	29.9
Intersegment
Segment Data
Net sales									(102.6)	(43.2)	(9.3)
Operating income									(5.8)	(2.9)	0.1
Depreciation and amortization									(0.4)	(0.1)
Capital Expenditures									(2.1)	(1.1)
Assets	(18.2)				(15.5)				(18.2)	(15.5)
Corporate
Segment Data
Operating income									(53.2)	(42.0)	(33.4)
Depreciation and amortization									5.6	4.9	5.5
Capital Expenditures									5.3	3.9	2.7
Assets	$ 151.0				$ 471.7				$ 151.0	$ 471.7