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Length of Time Fixed Maturity Securities had been in a Gross Unrealized Loss Position (Detail) - USD ($)
$ in Millions
Sep. 30, 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 $ 204.7 $ 9.3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 22.5 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 4.5 0.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0.5 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 2,420.8 326.4
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 713.7 6.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 35.0 0.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 18.1 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 218.4 234.4
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 74.3 18.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 45.4 10.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 25.5 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 2,640.6 263.3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 340.6 9.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 104.0 17.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 46.0 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 399.5 29.2
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 32.1 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 17,240.4 2,146.3
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,606.5 51.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 850.8 199.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 326.8 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 23,127.9 3,008.9
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,790.2 86.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer 1,039.8 228.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss $ 416.9 $ 13.5