Income Taxes (Details 4) - USD ($)	3 Months Ended
	Mar. 31, 2015	Jun. 30, 2015	Oct. 31, 2014	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Deferred tax assets, pensions		$ 125,100,000		$ 82,700,000
Deferred tax assets, postretirement provisions		48,900,000		66,900,000
Deferred tax assets, net operating loss carryforwards		20,300,000		20,600,000
Deferred tax assets, Derivatives and hedging activities		18,500,000		0
Deferred tax assets, other		32,600,000		35,000,000
Gross deferred tax assets		245,400,000		205,200,000
Deferred tax assets, valuation allowances		(17,500,000)		(17,800,000)
Net deferred tax assets		227,900,000		187,400,000
Deferred tax liabilities, depreciation		(321,200,000)		(232,300,000)
Deferred tax liabilities, intangible assets		(26,100,000)		(37,500,000)
Deferred tax liabilities, inventories		(17,600,000)		(28,800,000)
Deferred tax liabilities, Other		(6,200,000)		(4,000,000)
Total deferred tax liabilities		(371,100,000)		(302,600,000)
Deferred tax liabilities		(143,200,000)		$ (115,200,000)
Undistributed earnings of foreign subsidiaries		$ 118,500,000
Share repurchase program, authorized amount			$ 500,000,000
Foreign earnings repatriated	$ 38,000,000