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Equity Security Investments Using the Measurement Alternative Method (Tables)
 12 Months Ended
Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Summary of Equity Security Investments
The summary below represents the Company’s equity security investments using the measurement alternative method that do not have readily determinable fair values and as of December 31 are summarized as follows ($ in millions):

20242023
Equity security investments$26.4 $28.6 
Net unrealized gains (losses) are summarized as follows ($ in millions):
Year Ended December 31,
202420232022
Investment loss
    Unrealized loss$(1.5)$(3.3)$— 
Total$(1.5)$(3.3)$—