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, 2019	Jun. 30, 2018
Asset Derivatives:
Total asset derivatives	$ 15.4	$ 35.2
Liability Derivatives:
Total liability derivatives	30.1	3.4
Other current assets
Asset Derivatives:
Total asset derivatives	7.3	15.8
Other assets
Asset Derivatives:
Total asset derivatives	8.1	19.4
Accrued liabilities
Liability Derivatives:
Total liability derivatives	17.3	0.1
Other liabilities
Liability Derivatives:
Total liability derivatives	12.8	3.3
Interest Rate Swaps
Asset Derivatives:
Total asset derivatives	0.3	0.1
Liability Derivatives:
Total liability derivatives	0.2	2.9
Interest Rate Swaps | Other current assets
Asset Derivatives:
Total asset derivatives	0.0	0.1
Interest Rate Swaps | Other assets
Asset Derivatives:
Total asset derivatives	0.3	0.0
Interest Rate Swaps | Accrued liabilities
Liability Derivatives:
Total liability derivatives	0.0	0.0
Interest Rate Swaps | Other liabilities
Liability Derivatives:
Total liability derivatives	0.2	2.9
Foreign exchange contracts
Asset Derivatives:
Total asset derivatives	1.3	0.4
Liability Derivatives:
Total liability derivatives	0.8	0.1
Foreign exchange contracts | Other current assets
Asset Derivatives:
Total asset derivatives	1.3	0.4
Foreign exchange contracts | Other assets
Asset Derivatives:
Total asset derivatives	0.0	0.0
Foreign exchange contracts | Accrued liabilities
Liability Derivatives:
Total liability derivatives	0.0	0.1
Foreign exchange contracts | Other liabilities
Liability Derivatives:
Total liability derivatives	0.8	0.0
Commodity contracts
Asset Derivatives:
Total asset derivatives	13.8	34.7
Liability Derivatives:
Total liability derivatives	29.1	0.4
Commodity contracts | Other current assets
Asset Derivatives:
Total asset derivatives	6.0	15.3
Commodity contracts | Other assets
Asset Derivatives:
Total asset derivatives	7.8	19.4
Commodity contracts | Accrued liabilities
Liability Derivatives:
Total liability derivatives	17.3	0.0
Commodity contracts | Other liabilities
Liability Derivatives:
Total liability derivatives	$ 11.8	$ 0.4