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Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
United States Government and Government Agencies and Authorities    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months $ 246.6 $ 9.3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 22.6 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 12.2 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 3.3 0.0
States, Municipalities, and Political Subdivisions    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 1,920.1 326.4
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 476.1 6.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 346.6 0.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 159.8 0.0
Foreign Governments    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 160.1 234.4
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 47.9 18.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 176.9 10.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 68.0 1.8
Public Utilities    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 2,242.2 263.3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 252.0 9.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 255.2 17.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 103.0 0.7
Mortgage/Asset-backed Securities    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 386.6 29.2
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 27.0 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0.1 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0 0.0
All Other Corporate Bonds    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 15,865.6 2,146.3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,799.7 51.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,194.1 199.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 768.1 11.0
Redeemable Preferred Stocks    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 3.5  
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0.5  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 0.0  
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.0  
Fixed Maturity Securities    
Debt Securities, Available-for-sale, Unrealized Loss Position    
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months 20,824.7 3,008.9
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,625.8 86.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 2,985.1 228.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 1,102.2 $ 13.5