Derivatives and Hedging Activities - Schedule of fair value and location of outstanding derivative contracts recorded in consolidated balance sheets (Details) - USD ($) $ in Millions	Dec. 31, 2016	Jun. 30, 2016
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	$ 5.5	$ 11.8
Derivatives designated as hedging instruments, Liability	18.9	43.9
Other current assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	3.3	2.1
Other assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	2.2	9.7
Accrued liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	15.2	31.6
Other liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	3.7	12.3
Interest rate swaps
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	3.0	10.9
Derivatives designated as hedging instruments, Liability	0.0	0.0
Interest rate swaps | Other current assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	0.9	1.2
Interest rate swaps | Other assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	2.1	9.7
Interest rate swaps | Accrued liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	0.0	0.0
Interest rate swaps | Other liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	0.0	0.0
Foreign exchange contracts
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	1.0	0.3
Derivatives designated as hedging instruments, Liability	0.1	0.3
Foreign exchange contracts | Other current assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	1.0	0.3
Foreign exchange contracts | Other assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	0.0	0.0
Foreign exchange contracts | Accrued liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	0.1	0.3
Foreign exchange contracts | Other liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	0.0	0.0
Commodity contracts
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	1.5	0.6
Derivatives designated as hedging instruments, Liability	18.8	43.6
Commodity contracts | Other current assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	1.4	0.6
Commodity contracts | Other assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	0.1	0.0
Commodity contracts | Accrued liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	15.1	31.3
Commodity contracts | Other liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	$ 3.7	$ 12.3