Derivatives and Hedging Activities - Schedule of fair value and location of outstanding derivative contracts recorded in consolidated balance sheets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018
Asset Derivatives:
Total asset derivatives	$ 11.2	$ 35.2
Liability Derivatives:
Total liability derivatives	12.0	3.4
Other current assets
Asset Derivatives:
Total asset derivatives	3.3	15.8
Other assets
Asset Derivatives:
Total asset derivatives	7.9	19.4
Accrued liabilities
Liability Derivatives:
Total liability derivatives	4.1	0.1
Other liabilities
Liability Derivatives:
Total liability derivatives	7.9	3.3
Interest Rate Swaps
Asset Derivatives:
Total asset derivatives	0.0	0.1
Liability Derivatives:
Total liability derivatives	3.4	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	0.0	0.0
Interest Rate Swaps | Accrued liabilities
Liability Derivatives:
Total liability derivatives	0.2	0.0
Interest Rate Swaps | Other liabilities
Liability Derivatives:
Total liability derivatives	3.2	2.9
Foreign exchange contracts
Asset Derivatives:
Total asset derivatives	0.7	0.4
Liability Derivatives:
Total liability derivatives	0.1	0.1
Foreign exchange contracts | Other current assets
Asset Derivatives:
Total asset derivatives	0.7	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	0.1	0.1
Foreign exchange contracts | Other liabilities
Liability Derivatives:
Total liability derivatives	0.0	0.0
Commodity contracts
Asset Derivatives:
Total asset derivatives	10.5	34.7
Liability Derivatives:
Total liability derivatives	8.5	0.4
Commodity contracts | Other current assets
Asset Derivatives:
Total asset derivatives	2.6	15.3
Commodity contracts | Other assets
Asset Derivatives:
Total asset derivatives	7.9	19.4
Commodity contracts | Accrued liabilities
Liability Derivatives:
Total liability derivatives	3.8	0.0
Commodity contracts | Other liabilities
Liability Derivatives:
Total liability derivatives	$ 4.7	$ 0.4