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Long-term Debt (Tables)
 12 Months Ended
Jun. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Liability and Equity Components of Long-term Debt
The net carrying amount of the liability component of the Notes is as follows:
(in millions of U.S. Dollars)
June 30, 2019
Principal

$575.0

Unamortized discount and issuance costs
(105.9
)
Net carrying amount

$469.1

The net carrying amount of the equity component of the Notes is as follows:
(in millions of U.S. Dollars)
June 30, 2019
Discount related to value of conversion options

$113.3

Debt issuance costs
(2.7
)
Net carrying amount

$110.6
Schedule of Interest Expense
The interest expense recognized related to the Notes is as follows:
(in millions of U.S. Dollars)
June 30, 2019
Interest expense

$4.3

Amortization of discount and issuance costs
18.3

Total interest expense

$22.6