Business Segments - Schedule of Results of Operation, Depreciation and Amortization, Capital Expenditures and Total Assets by Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023
Net Sales
Total net sales	$ 651.9	$ 522.9
Operating Income (Loss)
Consolidated operating income	69.0	8.3
Depreciation and Amortization
Consolidated depreciation and amortization	33.1	32.3
Capital Expenditures
Consolidated capital expenditures	22.0	13.5
Total Assets
Consolidated total assets	3,076.8		$ 3,053.9
Operating | Specialty Alloys Operations
Net Sales
Total net sales	570.1	447.3
Operating Income (Loss)
Consolidated operating income	80.8	19.9
Depreciation and Amortization
Consolidated depreciation and amortization	27.8	27.1
Capital Expenditures
Consolidated capital expenditures	18.6	11.4
Total Assets
Consolidated total assets	2,503.1		2,461.2
Operating | Performance Engineered Products
Net Sales
Total net sales	101.8	93.2
Operating Income (Loss)
Consolidated operating income	9.1	6.3
Depreciation and Amortization
Consolidated depreciation and amortization	4.0	3.8
Capital Expenditures
Consolidated capital expenditures	3.2	2.0
Total Assets
Consolidated total assets	448.2		451.6
Corporate
Operating Income (Loss)
Consolidated operating income	(21.3)	(17.1)
Depreciation and Amortization
Consolidated depreciation and amortization	1.3	1.4
Capital Expenditures
Consolidated capital expenditures	0.2	0.1
Total Assets
Consolidated total assets	139.7		159.0
Intersegment
Net Sales
Total net sales	(20.0)	(17.6)
Operating Income (Loss)
Consolidated operating income	0.4	$ (0.8)
Total Assets
Consolidated total assets	$ (14.2)		$ (17.9)