Business Segments (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014
Segment Data
Net sales	$ 548.4	$ 503.5	$ 1,098.2	$ 1,002.1
Operating income	45.0	47.5	67.2	103.3
Depreciation and Amortization	30.1	26.8	60.6	53.5
Capital Expenditures	68.4	114.2	127.4	204.5
Total Assets	3,055.0		3,055.0		3,057.5
Operating
Segment Data
Pension earnings, interest and deferrals	(2.4)	(3.8)	(4.7)	(9.8)
Corporate
Segment Data
Operating income	(7.0)	(11.3)	(17.3)	(24.2)
Depreciation and Amortization	1.2	1.5	2.3	3.0
Capital Expenditures	0.3	2.6	1.3	3.1
Total Assets	140.7		140.7		144.9
Intersegment
Segment Data
Net sales	(23.6)	(17.7)	(39.7)	(32.6)
Operating income	(1.6)	(0.4)	(1.0)	(1.0)
Depreciation and Amortization	(0.2)	(0.2)	(0.5)	(0.3)
Capital Expenditures	(0.7)	(0.2)	(1.1)	(0.4)
Total Assets	(34.0)		(34.0)		(33.9)
Specialty Alloys Operations | Operating
Segment Data
Net sales	438.3	407.5	874.2	802.5
Operating income	43.4	54.4	68.0	118.1
Depreciation and Amortization	23.2	19.6	46.8	39.1
Capital Expenditures	52.7	106.7	104.3	189.7
Total Assets	2,437.5		2,437.5		2,454.8
Performance Engineered Products | Operating
Segment Data
Net sales	133.7	113.7	263.7	232.2
Operating income	12.6	8.6	22.2	20.2
Depreciation and Amortization	5.9	5.9	12.0	11.7
Capital Expenditures	16.1	5.1	22.9	12.1
Total Assets	$ 510.8		$ 510.8		$ 491.7