Business Segments (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014
Segment Data
Net sales	$ 549.8	$ 498.6
Operating income	22.1	55.8
Depreciation and Amortization	30.3	26.7
Capital Expenditures	59.0	90.4
Assets	3,012.2		3,057.5
Operating
Segment Data
Pension earnings, interest and deferrals	(2.4)	(6.0)
Corporate
Segment Data
Operating income	(10.3)	(12.9)
Depreciation and Amortization	1.1	1.4
Capital Expenditures	1.0	0.6
Assets	80.6		144.9
Intersegment
Segment Data
Net sales	(16.1)	(14.8)
Operating income	0.5	(0.6)
Depreciation and Amortization	(0.3)
Capital Expenditures	(0.4)	(0.2)
Assets	(33.5)		(33.9)
Specialty Alloys Operations | Operating
Segment Data
Net sales	436.0	394.9
Operating income	24.6	63.7
Depreciation and Amortization	23.5	19.5
Capital Expenditures	51.6	83.0
Assets	2,466.1		2,454.8
Performance Engineered Products | Operating
Segment Data
Net sales	129.9	118.5
Operating income	9.7	11.6
Depreciation and Amortization	6.0	5.8
Capital Expenditures	6.8	7.0
Assets	$ 499.0		$ 491.7