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Derivatives and Hedging Activities (Tables) | 12 Months Ended
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Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of fair value and location of outstanding derivative contracts recorded in consolidated balance sheets | The fair value and location of outstanding derivative contracts recorded in the accompanying consolidated balance sheets were as follows as of June 30, 2018 and 2017:
June 30, 2018 ($ in millions) |  | Interest Rate Swaps |  | Foreign Currency Contracts |  | Commodity Contracts |  | Total Derivatives
Asset Derivatives: |  |  |  |  |  |  |  |  |  |  |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |
Other current assets |  | $ | 0.1 |  |  | $ | 0.4 |  |  | $ | 15.3 |  |  | $ | 15.8 |
Other assets |  | — |  |  | — |  |  | 19.4 |  |  | 19.4 |
Total asset derivatives |  | $ | 0.1 |  |  | $ | 0.4 |  |  | $ | 34.7 |  |  | $ | 35.2 |
Liability Derivatives: |  |  |  |  |  |  |  |  |  |  |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |
Other liabilities |  | 2.9 |  |  | — |  |  | 0.4 |  |  | 3.3 |
Total liability derivatives |  | $ | 2.9 |  |  | $ | 0.1 |  |  | $ | 0.4 |  |  | $ | 3.4 |
June 30, 2017 ($ in millions) |  | Interest Rate Swaps |  | Foreign Currency Contracts |  | Commodity Contracts |  | Total Derivatives
Asset Derivatives: |  |  |  |  |  |  |  |  |  |  |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |
Other current assets |  | $ | 0.6 |  |  | $ | 0.2 |  |  | $ | 6.4 |  |  | $ | 7.2 |
Other assets |  | 1.6 |  |  | — |  |  | 5.7 |  |  | 7.3 |
Total asset derivatives |  | $ | 2.2 |  |  | $ | 0.2 |  |  | $ | 12.1 |  |  | $ | 14.5 |
Liability Derivatives: |  |  |  |  |  |  |  |  |  |  |
Derivatives designated as hedging instruments: |  |  |  |  |  |  |  |  |  |  |
Accrued liabilities |  | $ | — |  |  | $ | 1.0 |  |  | $ | 12.1 |  |  | $ | 13.1 |
Other liabilities |  | — |  |  | — |  |  | 6.0 |  |  | 6.0 |
Total liability derivatives |  | $ | — |  |  | $ | 1.0 |  |  | $ | 18.1 |  |  | $ | 19.1 |
Summary of the gains (losses) related to cash flow hedges | The following is a summary of the gains (losses) related to cash flow hedges recognized during the years ended June 30, 2018, 2017 and 2016:
|  | Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion) Years Ended June 30,
($ in millions) |  | 2018 |  | 2017 |  | 2016
Derivatives in Cash Flow Hedging Relationship: |  |  |  |  |  |  |  |  |
Commodity contracts |  | $ | 41.4 |  |  | $ | 9.4 |  |  | $ | (34.0 | )
Foreign exchange contracts |  | (0.4 | ) |  | (0.1 | ) |  | 0.7 |
Total |  | $ | 41.0 |  |  | $ | 9.3 |  |  | $ | (33.3 | )
|  | Location of Gain (Loss) Reclassified from AOCI into Income |  | Amount of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Years Ended June 30,
($ in millions) |  | (Effective Portion) |  | 2018 |  | 2017 |  | 2016
Derivatives in Cash Flow Hedging Relationship: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | Cost of sales |  | $ | 3.8 |  |  | $ | (22.8 | ) |  | $ | (44.6 | )
Foreign exchange contracts |  | Net sales |  | (1.0 | ) |  | 0.5 |  |  | 0.2 |
Forward interest rate swaps |  | Interest expense |  | 0.4 |  |  | 0.4 |  |  | 0.4 |
Total |  |  |  | $ | 3.2 |  |  | $ | (21.9 | ) |  | $ | (44.0 | )
|  | Location of (Loss) Gain Reclassified from AOCI into Income |  | Amount of (Loss) Gain Reclassified from AOCI into Income (Ineffective Portion) Years Ended June 30,
($ in millions) |  | (Ineffective Portion) |  | 2018 |  | 2017 |  | 2016
Derivatives in Cash Flow Hedging Relationship: |  |  |  |  |  |  |  |  |  |  |
Commodity contracts |  | Cost of sales |  | $ | (2.0 | ) |  | $ | 2.0 |  |  | $ | 1.5 |
Schedule of changes in AOCI associated with derivative hedging activities | The changes in AOCI associated with derivative hedging activities during the years ended June 30, 2018, 2017 and 2016 were as follows:
($ in millions) |  | 2018 |  | 2017 |  | 2016
Balance, beginning |  | $ | (2.3 | ) |  | $ | (21.8 | ) |  | $ | (28.5 | )
Current period changes in fair value, net of tax |  | 26.9 |  |  | 5.8 |  |  | (20.8 | )
Reclassification to earnings, net of tax |  | (0.8 | ) |  | 13.7 |  |  | 27.5 |
Balance, ending |  | $ | 23.8 |  |  | $ | (2.3 | ) |  | $ | (21.8 | )

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