Acquisition and Strategic Partnership (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended		1 Months Ended	12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Feb. 29, 2012 Latrobe Acquisition	Jun. 30, 2012 Latrobe Acquisition	Jun. 30, 2011 Latrobe Acquisition	Jun. 30, 2013 Latrobe Acquisition	Jun. 30, 2012 Latrobe Acquisition Preliminary Purchase Price Allocation	Jun. 30, 2013 Latrobe Acquisition Measurement Period Adjustments	Dec. 15, 2011 Arwin
Acquisition and strategic partnership disclosures
Shares issued through business acquisition			8.1
Cash paid, net of cash acquired	$ 12.9	$ 45.4	$ 11.5
Cash acquired			2.5
Summary of preliminary purchase price allocation
Accounts receivable						67.0	67.3	(0.3)
Inventory						242.6	241.2	1.4
Property, plant and equipment						172.4	172.4		0.7
Intangible assets						87.1	87.1
Other						9.8	10.6	(0.8)
Accounts Payable and accrued liabilities						(64.1)	(63.9)	(0.2)
Long-term debt						(153.7)	(153.7)
Pension and other postretirement liabilities						(100.8)	(100.8)
Deferred income taxes						(45.0)	(47.7)	2.7
Total identifiable net assets						215.3	212.5	2.8
Goodwill						211.7	214.5	(2.8)	0.7
Total purchase price						427.0	427.0		1.4
Additional disclosure
Goodwill recognized deductible for income tax purposes			0
Acquisition-related costs	11.7	3.1		11.7	2.4
Transaction costs						5.2
Net sales				163.2
Operating income since acquisition				10.5
Fair value cost inventory adjustments				11.6
Proforma results
Revenue				2,339.6	2,125.3
Earnings				$ 160.1	$ 93.5
Earnings per Common Share, Basic (in dollars per share)				$ 3.04	$ 1.78
Earnings per Common Share, Diluted (in dollars per share)				$ 3.01	$ 1.77