Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Subsequent Event (Details) $ in Millions		3 Months Ended			9 Months Ended
Subsequent Event (Details) $ in Millions	Apr. 29, 2020 powder_production_facility	Jun. 30, 2020 USD ($) employment_position	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Subsequent Event [Line Items]
Restructuring charges			$ 0.0	$ 0.0	$ 2.3	$ 0.0
Subsequent Event
Subsequent Event [Line Items]
Number of small domestic power metals production facilities closed \| powder_production_facility	2
Forecast \| Subsequent Event
Subsequent Event [Line Items]
Expected number of employment positions eliminated \| employment_position		220
Minimum \| Forecast \| Subsequent Event
Subsequent Event [Line Items]
Restructuring charges		$ 80.0
Maximum \| Forecast \| Subsequent Event
Subsequent Event [Line Items]
Restructuring charges		$ 100.0