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Fair Value Measurements
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The following tables present the Company's fair value hierarchy for financial assets and liabilities measured as of December 31, 2023 and 2022 ($ in millions):
December 31, 2023
Level 1 Level 2 Level 3 Total
Financial Assets:       
Corporate debt securities$— $449.9 $— $449.9 
U.S. Government obligations— 175.9 — 175.9 
Asset-backed securities— 1.6 — 1.6 
Fixed maturities— 627.4 — 627.4 
Short term investments— 45.8 — 45.8 
Total$— $673.2 $— $673.2 
Financial Liabilities:
Warrant liability (1)
$— $— $— $— 
(1)    Fair value of Public and Private warrant liability amounted to less than $0.1 million as of December 31, 2023.
December 31, 2022
Level 1Level 2Level 3Total
Financial Assets:    
Corporate debt securities$— $530.2 $— 530.2 
U.S. Government obligations— 117.3 — 117.3 
Asset-backed securities— 2.8 — 2.8 
Fixed maturities— 650.3 — 650.3 
Short term investments— 99.8 — 99.8 
Total$— $750.1 $— $750.1 
Financial Liabilities:
Warrant liability$— $— $0.3 $0.3 
The fair value of all our different classes of Level 2 fixed maturities and short-term investments are estimated by using quoted prices from a third-party valuation service provider to gather, analyze and interpret market information and derive fair values based upon relevant methodologies and assumptions for individual instruments.
There were no transfers between Level 1, Level 2, or Level 3 during the year ended December 31, 2023, other than the public and private warrants previously reported as Level 3 as discussed below. There were no transfers between Level 1, Level 2 or Level 3 during the year ended December 31, 2022.
Warrant liability
As part of the Metromile Acquisition as discussed in Note 5, public and private warrants were assumed and are measured at fair value on a recurring basis at the end of the reporting period, and classified as Level 3 for fair value hierarchy disclosure purposes as of December 31, 2022. These warrants do not meet the criteria for equity treatment and are recorded as a liability and presented under “Other liabilities and accrued expenses” on the consolidated balance sheet at fair value, with changes in fair value recognized and presented under “General and administrative expenses” in the consolidated statement of operations and comprehensive loss. The Company utilized the binomial Monte-Carlo simulation to estimate the fair value of these warrants which were not actively traded as of December 31, 2022, and are determined based on the following assumptions:

December 31, 2022
Weighted average expected term (years)3.11
Risk-free interest rate4.2%
Volatility80%
Expected dividend yield—%

The public warrants liability is classified as Level 1 for fair value hierarchy disclosure purposes as of March 31, 2023, due to the use of an observable market quote in an active market, following the listing of the public warrants in New York Stock Exchange American. The Company also reclassified the private warrants liability from Level 3 to Level 2 as of March 31, 2023, as the Company utilizes the observable prices of the public warrants in deriving the value of the private placement warrants.
The following table below presents the change in fair value of the warrant liability ($ in millions):

December 31,
20232022
Balance as of January 1$0.3 $— 
Initial measurement of warrants liability as of July 31, 2022— 0.5 
Change in fair value(0.3)(0.2)
Balance as of December 31$— $0.3