XML 104 R55.htm IDEA: XBRL DOCUMENT v3.22.4
Debt - Schedule of Components of Interest Expense and Effective Interest Rates of Senior Convertible Notes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash interest expense:      
Contractual coupon interest $ 8.8 $ 9.3 $ 9.3
Non-cash interest expense:      
Amortization of debt issuance costs 5.9 6.0 5.5
Total interest expense recognized on senior notes $ 14.7 $ 15.3 $ 14.8
Convertible Notes due 2022      
Non-cash interest expense:      
Effective interest rate (as a percent)     1.30%
Convertible Notes due 2023      
Non-cash interest expense:      
Effective interest rate (as a percent) 1.10% 1.10% 1.10%
Convertible Notes due 2025      
Non-cash interest expense:      
Effective interest rate (as a percent) 0.50% 0.50% 0.50%