Reclassifications from Accumulated Other Comprehensive (Loss) Income Schedule of amounts reclassified from AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Amount reclassified from AOCI
Cost of sales	$ (377.5)	$ (463.4)	$ (764.5)	$ (944.1)
Net sales	443.8	548.4	899.4	1,098.2
Interest expense	(7.0)	(6.8)	(13.6)	(13.8)
Income before income taxes	15.1	38.2	31.2	58.2
Income tax (benefit) expense	(3.6)	(14.1)	(10.8)	(20.6)
Net income	11.5	24.1	20.4	37.6
Cash flow hedging items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Income before income taxes	(10.8)	(2.7)	(20.2)	(0.3)
Income tax (benefit) expense	4.1	1.0	7.6	0.1
Net income	(6.7)	(1.7)	(12.6)	(0.2)
Cash flow hedging items | Amount Reclassified from AOCI | Commodity contracts
Amount reclassified from AOCI
Cost of sales	(11.1)	(3.5)	(20.5)	(1.5)
Cash flow hedging items | Amount Reclassified from AOCI | Foreign exchange contracts
Amount reclassified from AOCI
Net sales	0.2	0.7	0.1	1.0
Cash flow hedging items | Amount Reclassified from AOCI | Interest rate swaps
Amount reclassified from AOCI
Interest expense	0.1	0.1	0.2	0.2
Pension and other postretirement benefit plan items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Net actuarial loss	(7.5)	(4.7)	(15.1)	(9.4)
Prior service cost (credits)	1.5	(0.1)	3.1	(0.2)
Income before income taxes	(6.0)	(4.8)	(12.0)	(9.6)
Income tax (benefit) expense	2.3	1.9	4.6	3.7
Net income	$ (3.7)	$ (2.9)	$ (7.4)	$ (5.9)