Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				12 Months Ended
	Jun. 30, 2014 item	Jun. 30, 2013 item	Jun. 30, 2012 item	Nov. 30, 2012 Sandvik Powdermet AB	Jun. 30, 2014 Computer software Minimum	Jun. 30, 2014 Computer software Maximum	Jun. 30, 2014 Intangible Assets Minimum	Jun. 30, 2014 Intangible Assets Maximum	Jun. 30, 2014 Carpenter Powder Products AB	Nov. 30, 2012 Carpenter Powder Products AB
Revenue Recognition
Discounts, rebates, returns and allowances	$ 28.3	$ 26.4	$ 18.7
Summary of significant accounting policies
Ownership interest (as a percent)				40.00%						40.00%
Ownership interest of noncontrolling partner (as a percent)									40.00%
Research and development expenditures	18.5	19.4	20.5
Inventory under FIFO method or average cost methods	161.2	173.3
Estimated useful life					3 years	7 years	2 years 6 months	30 years
Capitalized software amortization expense	$ 6.4	$ 6.8	$ 6.1
Number of former operating facility site that the liability for future costs is discounted to present value	1
Liability for future costs discount amortization period	20 years
Number of share-based employee compensation plans	2
Number of customers accounted for 10% or more of the sales	0	0	0