Income Taxes (Details 4) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011
Income Taxes
Deferred tax assets, pensions	$ 132.1	$ 75.7
Deferred tax assets, postretirement provisions	90.8	48.0
Deferred tax assets, net operating loss carryforwards	20.7	20.5
Deferred tax assets, environmental	4.5	12.8
Deferred tax assets, other	44.5	19.5
Gross deferred tax assets	292.6	176.5
Deferred tax assets, valuation allowances	(18.1)	(17.5)
Net deferred tax assets	274.5	159.0
Deferred tax liabilities, depreciation	(239.5)	(177.7)
Deferred tax liabilities, intangible assets	(41.2)	(9.4)
Deferred tax liabilities, inventories	(12.9)	(5.3)
Deferred tax liabilities, Other	(1.7)
Total deferred tax liabilities	(295.3)	(192.4)
Deferred tax liabilities	(20.8)	(33.4)
Undistributed earnings of foreign subsidiaries	$ 114.0