Segment Information, Geographic and Product Data (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2012
Segment Data
Net sales	$ 604.6	$ 566.3	$ 503.5	$ 498.6	$ 611.8	$ 581.4	$ 533.5	$ 544.9	$ 2,173.0	$ 2,271.7	$ 2,028.7
Operating income	59.2	49.5	47.5	55.8	65.4	53.0	52.7	61.6	212.0	232.7	210.1
Depreciation and Amortization									111.9	104.1	83.8
Capital Expenditures									349.2	310.2	157.8
Assets	3,057.5				2,882.9				3,057.5	2,882.9
Operating
Segment Data
Pension earnings, interest & deferrals									(21.8)	(31.9)	(15.3)
Corporate
Segment Data
Operating income									(43.8)	(47.7)	(53.2)
Depreciation and Amortization									5.5	5.9	5.6
Capital Expenditures									5.4	4.1	5.4
Assets	144.9				233.7				144.9	233.7
Intersegment
Segment Data
Net sales									(67.2)	(71.9)	(88.2)
Operating income									(0.6)	(1.4)	(5.9)
Depreciation and Amortization									(0.8)	(0.6)	(0.3)
Capital Expenditures									(0.8)	(1.5)	(2.1)
Assets	(33.9)				(42.0)				(33.9)	(42.0)
Specialty Alloys Operations | Operating
Segment Data
Net sales									1,741.6	1,823.5	1,672.0
Operating income									232.7	268.5	236.3
Depreciation and Amortization									83.4	76.7	59.7
Capital Expenditures									319.9	283.5	114.3
Assets	2,454.8				2,192.7				2,454.8	2,192.7
Performance Engineered Products | Operating
Segment Data
Net sales									498.6	520.1	444.9
Operating income									45.5	45.2	48.2
Depreciation and Amortization									23.8	22.1	18.8
Capital Expenditures									24.7	24.1	40.2
Assets	$ 491.7				$ 498.5				$ 491.7	$ 498.5