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Debt (Tables) | 3 Months Ended
--- | ---
Sep. 30, 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 three months ended September 30, 2018, were as follows (in millions):
|  | Three Months Ended |
|  | September 30, |
|  | 2018 |
Interest expense |  | $ | 0.7 |
Amortization of discount and debt issuance costs |  |  | 4.4 |
Total interest |  | $ | 5.1 |

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