Segment Information, Geographic and Product Data (Details 2) (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
Segment 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
Pension earnings, interest & deferrals									(31.9)	(15.3)	(35.2)
Operating income	65.4	53.0	52.7	61.6	66.5	55.7	43.9	44.0	232.7	210.1	96.4
Depreciation and amortization									104.1	83.8	66.5
Capital Expenditures									336.9	171.9	79.6
Assets	2,882.9				2,627.8				2,882.9	2,627.8
Specialty Alloys Operations
Segment Data
Net sales									1,547.4	1,566.6	1,431.3
Operating income									218.9	229.4	139.3
Depreciation and amortization									56.7	53.2	51.1
Capital Expenditures									284.8	121.1	51.6
Assets	1,537.9				1,293.4				1,537.9	1,293.4
Latrobe
Segment Data
Net sales									491.2	200.8	38.7
Operating income									58.3	11.0	2.2
Depreciation and amortization									22.7	7.7	0.4
Capital Expenditures									25.0	7.9	0.4
Assets	771.6				807.6				771.6	807.6
Performance Engineered Products
Segment Data
Net sales									378.8	365.7	248.3
Operating income									36.5	44.1	35.0
Depreciation and amortization									19.4	17.7	10.2
Capital Expenditures									24.7	40.0	24.8
Assets	391.7				394.7				391.7	394.7
Corporate
Segment Data
Operating income									(47.7)	(53.2)	(42.0)
Depreciation and amortization									5.9	5.6	4.9
Capital Expenditures									4.0	5.0	3.9
Assets	233.7				191.4				233.7	191.4
Intersegment
Segment Data
Net sales									(145.7)	(104.4)	(43.2)
Operating income									(1.4)	(5.9)	(2.9)
Depreciation and amortization									(0.6)	(0.4)	(0.1)
Capital Expenditures									(1.6)	(2.1)	(1.1)
Assets	$ (52.0)				$ (59.3)				$ (52.0)	$ (59.3)