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Debt (Tables) | 9 Months Ended
--- | ---
Mar. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Contractual Interest Expense and Amortization of Discount on Notes | The contractual interest expense and amortization of discount on the Notes for the nine months ended March 31, 2018, were as follows (in millions):
|  | Nine Months Ended |
|  | March 31, |
|  | 2018 |
Interest expense |  | $ | 2.0 |
Amortization of discount and debt issuance costs |  |  | 12.7 |
Total interest |  | $ | 14.7 |

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