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Restructuring Charges (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 25.3us-gaap_RestructuringCharges	$ 0us-gaap_RestructuringCharges	$ 25.3us-gaap_RestructuringCharges	$ 0us-gaap_RestructuringCharges
Various personnel-related costs to cover severance payments, medical coverage and related items
Restructuring Cost and Reserve [Line Items]
Restructuring charges	10.6		10.6
Various personnel-related costs to cover severance payments, medical coverage and related items \| Non-cash forfeiture income
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.4
Various personnel-related costs to cover severance payments, medical coverage and related items \| Non-cash asset impairment charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5.4		5.4
Various personnel-related costs to cover severance payments, medical coverage and related items \| Corporate assets
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	3.4		3.4
Various personnel-related costs to cover severance payments, medical coverage and related items \| Pension liability
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	7.6		7.6
Ultra-fine grain materials development program
Restructuring Cost and Reserve [Line Items]
Restructuring charges	13.4		13.4
Exit licensing agreement
Restructuring Cost and Reserve [Line Items]
Restructuring charges	8.0		8.0
Facility closure
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.3		$ 1.3

- Definition

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.

+ References+ Details