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Convertible Senior Notes (Tables)
6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Notes Net of Discount and Deferred Financing Costs
The following table presents a summary of the 2024 Notes as of June 30, 2023.
Principal
Amount
Unamortized Issuance CostsNet Carrying
Amount
Fair Value
(in millions)AmountLeveling
2024 Notes$170.4 $(0.7)$169.7 $215.7 Level 2
The following table presents a summary of the 2024 Notes as of December 31, 2022.
Principal
Amount
Unamortized Issuance CostsNet Carrying
Amount
Fair Value
(in millions)AmountLeveling
2024 Notes$170.4 $(1.0)$169.4 $268.0 Level 2
The following table presents a summary of the interest expense of the 2024 Notes.
Three Months Ended
June 30,
Six Months Ended
June 30,
(in millions)2023202220232022
Coupon interest$1.1 $1.8 $2.0 $4.0 
Amortization of debt discount and issuance costs0.2 0.4 0.4 0.8 
Total interest expense$1.3 $2.2 $2.4 $4.8