XML 61 R50.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Investment Securities - Common Equity Securities and Other Long Term Investments (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Common equity securities    
Cost or Amortized Cost $ 483.5 $ 483.5
Gross Unrealized Gains 86.0 62.3
Gross Unrealized Losses (1.2) (1.2)
Net Foreign Currency Gains (Losses) (6.8) (6.2)
Carrying Value 561.5 538.4
Other long-term investments    
Cost or Amortized Cost 1,642.2 1,655.7
Gross Unrealized Gains 466.7 446.3
Other Long-Term Investments, Unrealized Loss (101.1) (94.5)
Net Foreign Currency Gains (Losses) (15.9) (9.3)
Carrying Value 1,991.9 1,998.2
MediaAlpha    
Investment in MediaAlpha    
Cost or Amortized Cost 59.2 59.2
Gross Unrealized Gains 406.4 195.7
Gross Unrealized Losses 0.0 0.0
Net Foreign Currency Gains (Losses) 0.0 0.0
Carrying Value $ 465.6 $ 254.9