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Marketable Securities and Fair Value Measurements
3 Months Ended
Mar. 31, 2023
Fair Value Disclosures [Abstract]  
Marketable Securities and Fair Value Measurements Marketable Securities and Fair Value Measurements The Company’s marketable securities consist of corporate bonds and government securities which are adjusted to fair value as of each balance sheet date based on quoted prices, which are considered Level 2 inputs.
The following is a summary of the Company’s available-for-sale marketable securities measured at fair value on a recurring basis.
March 31, 2023
(dollars in millions)
Valuation
Hierarchy
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Corporate bondsLevel 2$688.8 $— $(6.4)$682.4 
Corporate bondsLevel 2206.3 0.1 (6.0)200.4 
Government securitiesLevel 256.1 — (0.1)56.0 
Government securitiesLevel 254.7 0.1 (0.3)54.5 
Total$1,005.9 $0.2 $(12.8)$993.3 
 December 31, 2022
(dollars in millions)
Valuation
Hierarchy
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Fair Value
Corporate bondsLevel 2$802.7 $— $(9.3)$793.4 
Corporate bondsLevel 2205.3 — (9.2)196.1 
Government securitiesLevel 261.9 — (0.4)61.5 
Government securitiesLevel 273.3 — (0.3)73.0 
Total$1,143.2 $— $(19.2)$1,124.0 
The Company generally does not intend to sell any investments prior to recovery of their amortized cost basis for any investment in an unrealized loss position. As such, the Company has classified these losses as temporary in nature.
The carrying values of accounts receivable and accounts payable and accrued liabilities approximate their fair values due to the short-term nature of these assets and liabilities.