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Leases
 12 Months Ended
Dec. 31, 2021
Leases [Abstract]  
Leases LeasesOur corporate headquarters, for which we have operating leases with terms that expire beginning 2024 through 2031, are located in San Diego, California, and consist of office space and research and development laboratories. Certain of these lease agreements contain clauses for renewal at our option. As we were not reasonably certain to exercise any such options at commencement of these leases, no such options were recognized as part of the associated lease liabilities or right-of-use assets.
The following tables present supplemental operating lease information.
Year Ended December 31,
(in millions)202120202019
Operating lease cost$15.3 $10.1 $8.1 
Cash paid for amounts included in the measurement of operating lease liabilities$12.6 $8.6 $7.7 
December 31,
(in millions, except weighted average data)20212020
Weighted average remaining lease term
8.8 years10.3 years
Weighted average discount rate5.2 %5.6 %
Restricted cash related to letters of credit issued in lieu of cash security deposits$3.2 $3.2 
Approximate future minimum lease payments under operating leases were as follows:
(in millions)December 31,
2021
Year ending December 31, 2022
$17.0 
Year ending December 31, 2023
17.9 
Year ending December 31, 2024
17.4 
Year ending December 31, 2025
15.9 
Year ending December 31, 2026
15.7 
Thereafter70.4 
Total operating lease payments154.3 
Less accreted interest32.5 
Total operating lease liabilities121.8 
Less current operating lease liabilities included in other current liabilities16.5 
Noncurrent operating lease liabilities$105.3