Derivatives and Hedging Activities - Narrative (Details) lb in Millions	12 Months Ended
	Jun. 30, 2016 USD ($) lb	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contracts on a gross basis	$ 13,600,000
Derivative contracts liability on a gross basis	45,700,000
Cash collateral held by counterparties	0
Derivative losses included in AOCI	25,000,000
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Net gains recorded as a reduction to interest expense	$ (33,300,000)	$ (73,700,000)	$ 57,700,000
Commodity contracts | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Amounts of raw materials to be purchased from forward contracts (in lb) | lb	19.3
Net gains recorded as a reduction to interest expense	$ (34,000,000)	(76,300,000)	59,300,000
Forward interest rate swaps | Cash flow hedges | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gains recorded as a reduction to interest expense	300,000	300,000	300,000
Forward interest rate swaps | Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Total notional amounts of interest rate contracts	150,000,000	150,000,000
Net gains recorded as a reduction to interest expense	$ 2,600,000	$ 2,900,000	$ 0