Reclassifications from Accumulated Other Comprehensive Income (AOCI) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Amount reclassified from AOCI
Cost of sales	$ (463.4)	$ (408.1)	$ (944.1)	$ (803.3)
Net sales	548.4	503.5	1,098.2	1,002.1
Interest expense, net	(6.8)	(3.7)	(13.8)	(8.2)
Income before income taxes	38.2	44.4	58.2	95.9
Tax (expense) benefit	(14.1)	(14.9)	(20.6)	(31.8)
Net income	24.1	29.5	37.6	64.1
Cash flow hedging items | Amount Reclassified from AOCI
Amount reclassified from AOCI
Income before income taxes	(2.7)	(7.0)	(0.3)	(14.7)
Tax (expense) benefit	1.0	2.6	0.1	5.5
Net income	(1.7)	(4.4)	(0.2)	(9.2)
Cash flow hedging items | Amount Reclassified from AOCI | Commodity Contracts
Amount reclassified from AOCI
Cost of sales	(3.5)	(6.8)	(1.5)	(14.4)
Cash flow hedging items | Amount Reclassified from AOCI | Foreign Currency Contracts
Amount reclassified from AOCI
Net sales	0.7	(0.3)	1.0	(0.5)
Cash flow hedging items | Amount Reclassified from AOCI | Interest Rate Swaps
Amount reclassified from AOCI
Interest expense, net	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	(4.7)	(5.8)	(9.4)	(11.6)
Prior service cost	(0.1)	(0.1)	(0.2)	(0.2)
Income before income taxes	(4.8)	(5.9)	(9.6)	(11.8)
Tax (expense) benefit	1.9	2.0	3.7	4.3
Net income	$ (2.9)	$ (3.9)	$ (5.9)	$ (7.5)