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Debt (Tables) | 6 Months Ended
--- | ---
Dec. 31, 2017
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 six months ended December 31, 2017, were as follows (in millions):
|  | Six Months Ended |
|  | December 31, |
|  | 2017 |
Interest expense |  | $ | 1.3 |
Amortization of discount and debt issuance costs |  |  | 8.4 |
Total interest |  | $ | 9.7 |

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