Reclassifications from Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Amount reclassified from AOCI
Cost of sales									$ (1,908.4)	$ (1,774.1)	$ (1,838.2)
Net sales	$ 558.0	$ 570.6	$ 548.4	$ 549.8	$ 604.6	$ 566.3	$ 503.5	$ 498.6	2,226.7	2,173.0	2,271.7
Interest expense									(27.7)	(17.0)	(21.0)
Income before income taxes									89.1	196.4	216.8
Tax benefit									(30.4)	(63.6)	(70.3)
Net income	$ 22.5	$ (1.4)	$ 24.1	$ 13.5	$ 38.1	$ 30.6	$ 29.5	$ 34.6	58.7	132.8	$ 146.5
Reduction in other assets due to error related to equity method investment									4.9
Cash flow hedging items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Income before income taxes									(15.8)	(20.9)
Tax benefit									5.9	7.8
Net income									(9.9)	(13.1)
Cash flow hedging items | Amount Reclassified from AOCI | Commodity contracts
Amount reclassified from AOCI
Cost of sales									(18.5)	(20.5)
Cash flow hedging items | Amount Reclassified from AOCI | Foreign exchange contracts
Amount reclassified from AOCI
Net sales									2.3	(0.8)
Cash flow hedging items | Amount Reclassified from AOCI | Forward interest rate swaps
Amount reclassified from AOCI
Interest expense									0.4	0.4
Amortization of pension and other postretirement benefit plan items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Net actuarial loss									(18.7)	(23.0)
Prior service cost									(0.3)	(0.4)
Income before income taxes									(19.0)	(23.4)
Tax benefit									7.1	8.7
Net income									$ (11.9)	$ (14.7)