Reclassifications from Accumulated Other Comprehensive Income (AOCI) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Amount reclassified from AOCI
Cost of sales	$ (494.8)	$ (471.8)	$ (1,438.9)	$ (1,275.2)
Net sales	570.6	566.3	1,668.8	1,568.4
Interest expense, net	(7.1)	(2.7)	(20.9)	(10.8)
(Loss) income before income taxes	(2.3)	46.2	55.8	142.1
Income tax (benefit) expense	0.9	(15.6)	(19.6)	(47.4)
Net (loss) income	(1.4)	30.6	36.2	94.7
Cash flow hedging items | Amount Reclassified from AOCI
Amount reclassified from AOCI
(Loss) income before income taxes	(5.9)	(5.6)	(6.2)	(20.4)
Income tax (benefit) expense	2.2	2.1	2.3	7.6
Net (loss) income	(3.7)	(3.5)	(3.9)	(12.8)
Cash flow hedging items | Amount Reclassified from AOCI | Commodity Contracts
Amount reclassified from AOCI
Cost of sales	(6.9)	(5.4)	(8.4)	(19.9)
Cash flow hedging items | Amount Reclassified from AOCI | Foreign Currency Contracts
Amount reclassified from AOCI
Net sales	0.9	(0.3)	1.9	(0.8)
Cash flow hedging items | Amount Reclassified from AOCI | Interest Rate Swaps
Amount reclassified from AOCI
Interest expense, net	0.1	0.1	0.3	0.3
Pension and other postretirement benefit plan items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Net actuarial loss	(4.7)	(5.8)	(14.1)	(17.2)
Prior service cost	(0.1)	(0.1)	(0.3)	(0.4)
(Loss) income before income taxes	(4.8)	(5.9)	(14.4)	(17.6)
Income tax (benefit) expense	1.8	2.2	5.5	6.4
Net (loss) income	$ (3.0)	$ (3.7)	$ (8.9)	$ (11.2)