Derivatives and Hedging Activities - Schedule of fair value and location of outstanding derivative contracts recorded in consolidated balance sheets (Details) - USD ($) $ in Millions	Mar. 31, 2018	Jun. 30, 2017
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	$ 34.6	$ 14.5
Derivatives designated as hedging instruments, Liability	3.9	19.1
Other current assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	15.7	7.2
Other assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	18.9	7.3
Accrued liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	1.2	13.1
Other liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	2.7	6.0
Interest Rate Swaps
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	0.1	2.2
Derivatives designated as hedging instruments, Liability	2.3	0.0
Interest Rate Swaps | Other current assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	0.1	0.6
Interest Rate Swaps | Other assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	0.0	1.6
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	2.3	0.0
Foreign exchange contracts
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	0.0	0.2
Derivatives designated as hedging instruments, Liability	1.2	1.0
Foreign exchange contracts | Other current assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	0.0	0.2
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	1.2	1.0
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	34.5	12.1
Derivatives designated as hedging instruments, Liability	0.4	18.1
Commodity contracts | Other current assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	15.6	6.4
Commodity contracts | Other assets
Fair value of derivatives
Derivatives designated as hedging instruments, Asset	18.9	5.7
Commodity contracts | Accrued liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	0.0	12.1
Commodity contracts | Other liabilities
Fair value of derivatives
Derivatives designated as hedging instruments, Liability	$ 0.4	$ 6.0