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Debt (Tables)
 12 Months Ended
Dec. 31, 2024
Debt Disclosure [Abstract]  
Schedule of Debt
Debt consists of the following:

December 31
20242023
Interest RatesMaturities(in millions of dollars)
Long-term Debt
Outstanding Principal
   Senior Notes issued 19986.750 - 7.250%2028$335.8 $335.8 
   Senior Notes issued 20027.375%203239.5 39.5 
   Senior Notes issued 2012 and 20165.750%2042500.0 500.0 
Senior Notes issued 20153.875%2025— 275.0 
   Senior Notes issued 20194.000%2029400.0 400.0 
   Senior Notes issued 20194.500%2049450.0 450.0 
   Senior Notes issued 20214.125%2051600.0 600.0 
   Senior Notes issued 20244.046%2041400.0 — 
   Senior Notes issued 20246.000%2054400.0 — 
   Medium-term Notes issued 1990 - 19967.190%202818.5 18.5 
   Junior Subordinated Debt Securities issued 19987.405%2038189.7 189.7 
   Junior Subordinated Debt Securities issued 20186.250%2058300.0 300.0 
Term Loan issued 2022Variable2027— 350.0 
Unamortized Net Premium (Discount)
(131.3)2.5 
Unamortized Debt Issuance Costs(37.0)(30.6)
Total Long-term Debt$3,465.2 $3,430.4 
Short-term Debt
Outstanding Principal
   Senior Notes issued 20153.875%2025275.0 — 
   Unamortized Net Discount
(0.2)— 
   Unamortized Debt Issuance Costs
(0.2)— 
Total Short-term Debt274.6 — 
Total Debt$3,739.8 $3,430.4