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Debt Schedule of Debt (Tables)
9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Schedule of Debt
A summary of debt is as follows (in millions):
September 30, 2025December 31, 2024
MaturityCurrentLong-TermCurrentLong-Term
8.25% Notes:
Feb. 2027
Principal$— $— $— $74.3 
Interest— — 6.1 9.2 
2.25% Convertible Notes:
Nov. 2030
Principal— 402.5 — 402.5 
0% Convertible Notes:
Aug. 2032
Principal— 805.0 — — 
 Total$ $1,207.5 $6.1 $486.0 

A summary of interest expense and amortization of debt issuance costs is as follows (in millions):

Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Contractual interest expense
$2.3 $— $6.8 $— 
Amortization of debt issuance costs and discount
0.9 — 2.0 — 
Total interest expense on debt
$3.2 $ $8.8 $