XML 70 R59.htm IDEA: XBRL DOCUMENT v3.25.1
Total net investment income and net realized and unrealized investment gains - Net Realized Investment Losses on Other Long-Term Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net Investment Income [Line Items]    
Net realized investment losses on Other long-term investments $ (5.4) $ (3.7)
Other long-term investments    
Net Investment Income [Line Items]    
Net realized investment losses on Other long-term investments (2.1) (0.8)
Hedge funds and private equity funds    
Net Investment Income [Line Items]    
Net realized investment losses on Other long-term investments (1.3) 1.0
Strategic investments    
Net Investment Income [Line Items]    
Net realized investment losses on Other long-term investments $ (0.8) $ (1.8)