Reclassifications from Accumulated Other Comprehensive (Loss) Income Schedule of amounts reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Amount reclassified from AOCI
Cost of sales	$ (386.3)	$ (494.8)	$ (1,150.8)	$ (1,438.9)
Net sales	456.3	570.6	1,355.7	1,668.8
Interest expense	(7.2)	(7.1)	(20.8)	(20.9)
(Loss) income before income taxes	(33.0)	(2.3)	(1.8)	55.8
Income tax (benefit) expense	9.1	0.9	(1.8)	(19.6)
Net (loss) income	(23.9)	(1.4)	(3.6)	36.2
Cash flow hedging items | Amount Reclassified from AOCI
Amount reclassified from AOCI
(Loss) income before income taxes	(11.8)	(5.9)	(32.1)	(6.2)
Income tax (benefit) expense	4.4	2.2	12.1	2.3
Net (loss) income	(7.4)	(3.7)	(20.0)	(3.9)
Cash flow hedging items | Amount Reclassified from AOCI | Commodity contracts
Amount reclassified from AOCI
Cost of sales	(12.0)	(6.9)	(32.6)	(8.4)
Cash flow hedging items | Amount Reclassified from AOCI | Foreign exchange contracts
Amount reclassified from AOCI
Net sales	0.1	0.9	0.2	1.9
Cash flow hedging items | Amount Reclassified from AOCI | Interest rate swaps
Amount reclassified from AOCI
Interest expense	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	(7.5)	(4.7)	(22.5)	(14.1)
Prior service cost (credits)	1.5	(0.1)	4.5	(0.3)
(Loss) income before income taxes	(6.0)	(4.8)	(18.0)	(14.4)
Income tax (benefit) expense	2.2	1.8	6.8	5.5
Net (loss) income	$ (3.8)	$ (3.0)	$ (11.2)	$ (8.9)