Revenue - Summary of revenues by end-use markets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Consolidated net sales	$ 348.8	$ 573.0	$ 702.1	$ 1,158.4
Aerospace and Defense
Disaggregation of Revenue [Line Items]
Consolidated net sales	174.5	348.7	346.4	702.0
Medical
Disaggregation of Revenue [Line Items]
Consolidated net sales	32.4	49.0	65.2	98.0
Transportation
Disaggregation of Revenue [Line Items]
Consolidated net sales	31.6	38.4	60.8	78.4
Energy
Disaggregation of Revenue [Line Items]
Consolidated net sales	22.1	31.2	47.2	70.5
Industrial and Consumer
Disaggregation of Revenue [Line Items]
Consolidated net sales	66.0	78.0	139.4	151.3
Distribution
Disaggregation of Revenue [Line Items]
Consolidated net sales	$ 22.2	$ 27.7	$ 43.1	$ 58.2