Derivatives and Hedging Activities - Narrative (Details) lb in Millions	3 Months Ended
	Sep. 30, 2015 USD ($) lb	Sep. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)
Fair value of derivatives
Total asset derivatives on a gross basis			$ 8,400,000
Total liability derivatives on a gross basis			65,500,000
Cash collateral held by counterparties	$ 0		0
Net derivative losses included in AOCI expected to be reclassified into earnings	$ 21,800,000
Cash flow hedges | Commodity contracts
Fair value of derivatives
Amounts of raw materials to be purchased from forward contracts | lb	25.5
Cash flow hedges | Forward Interest Rate Swaps
Fair value of derivatives
Net gains recorded as a reduction to interest expense	$ 100,000	$ 100,000
Fair Value Hedging | Interest rate swaps
Fair value of derivatives
Net gains recorded as a reduction to interest expense	700,000	$ 400,000
Total notional amounts of interest rate contracts	$ 150,000,000		$ 150,000,000