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Debt (Tables) | 9 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Schedule of carrying amounts of the liability and equity components of convertible debt | The following table presents the carrying amounts of the liability and equity components (in millions):
| March 31, 2018 |  | July 1, 2017
Principal amount of 0.625% Senior Convertible Notes | $ | 428.5 |  |  | $ | 610.0 |
Principal amount of 1.00% Senior Convertible Notes | 460.0 |  |  | 460.0 |
Unamortized discount of liability component | (95.9 | ) |  | (129.4 | )
Unamortized debt issuance cost | (6.6 | ) |  | (9.2 | )
Carrying amount of liability component | $ | 786.0 |  |  | $ | 931.4 |
Current portion of long-term debt | 420.4 |  |  | — |
Long-term debt, net of current portion | $ | 365.6 |  |  | $ | 931.4 |
Carrying amount of equity component (1) | $ | 208.8 |  |  | $ | 229.7 |
(1) | Included in additional paid-in-capital on the Consolidated Balance Sheets.
Summary of effective interest rate and the interest expense for the contractual interest and the accretion of debt discount | The following table presents the interest expense for contractual interest, amortization of debt issuance cost and accretion of debt discount (in millions):
| Three Months Ended |  | Nine Months Ended
| March 31, 2018 |  | April 1, 2017 |  | March 31, 2018 |  | April 1, 2017
Interest expense-contractual interest | $ | 1.8 |  |  | $ | 1.3 |  |  | $ | 5.7 |  |  | $ | 3.4 |
Amortization of debt issuance cost | 0.6 |  |  | 0.6 |  |  | 1.9 |  |  | 1.8 |
Accretion of debt discount | 8.2 |  |  | 7.9 |  |  | 25.6 |  |  | 21.9 |

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- Definition Tabular disclosure of the debt and equity components of convertible debt instruments. + References No definition available. + Details
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