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Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of Debt
Debt consists of the following:

December 31
20192018
Interest RatesMaturities(in millions of dollars)
Long-term Debt
Outstanding Principal
   Senior Secured Notes issued 2007Variable  2037$80.0  $140.0  
   Senior Notes issued 19986.750 - 7.250%  2028335.8  365.8  
   Senior Notes issued 20027.375%  203239.5  39.5  
   Senior Notes issued 20105.625%  2020—  400.0  
   Senior Notes issued 2012 and 20165.750%  2042500.0  500.0  
   Senior Notes issued 20144.000%  2024350.0  350.0  
   Senior Notes issued 20153.875%  2025275.0  275.0  
   Senior Notes issued 20163.000%  2021—  350.0  
   Senior Notes issued 20194.000%  2029400.0  —  
   Senior Notes issued 20194.500%  2049450.0  —  
   Medium-term Notes issued 1990 - 19967.000 - 7.190%
2023 - 2028
20.5  50.8  
   Junior Subordinated Debt Securities issued 19987.405%  2038203.7  226.5  
   Junior Subordinated Debt Securities issued 20186.250%  2058300.0  300.0  
Fair Value Hedge Adjustment(0.6) (5.1) 
Less:
Unamortized Net Premium8.4  9.6  
Unamortized Debt Issuance Costs(35.4) (30.8) 
Total Long-term Debt 2,926.9  2,971.3  
Short-term Debt
Outstanding Principal
Senior Notes issued 20105.625%  2020400.0  —  
Less Unamortized Debt Issuance Costs(0.3) —  
Total Short-term Debt399.7  —  
Total Debt$3,326.6  $2,971.3