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DEBT (Tables)
 6 Months Ended
Jun. 30, 2024
Debt Disclosure [Abstract]  
Schedule of Convertible Notes and Components of Interest Expense The following table is a summary of the 2026 Notes as of June 30, 2024 and December 31, 2023 (in millions):
June 30, 2024December 31, 2023
Principal Amount$2,012.5 $2,012.5 
Unamortized Debt Discounts and Issuance Costs(13.0)(15.5)
Net Carrying Amount $1,999.5 $1,997.0 
Fair Value (Level 2)$1,071.7 $1,061.6 
The components of interest expense related to the 2026 Notes were as follows (in millions):
Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
Contractual interest$6.3 $6.3 $12.6 $12.6 
Amortization of debt discounts and debt issuance costs1.2 1.3 2.5 2.6 
Interest expense$7.5 $7.6 $15.1 $15.2