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Investments Investment Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Net Investment Income        
Gross Investment Income, Operating $ 545.4 $ 501.4 $ 1,570.9 $ 1,623.7
Less Investment Expenses 20.2 21.8 78.3 64.5
Less Investment Income on PFA Assets 2.8 2.8 8.4 8.5
Net Investment Income 522.4 476.8 1,484.2 1,550.7
Fixed Maturity Securities        
Net Investment Income        
Gross Investment Income, Operating 461.0 419.1 1,329.8 1,360.2
Derivatives        
Net Investment Income        
Gross Investment Income, Operating 4.0 3.7 11.4 5.6
Mortgage Loans        
Net Investment Income        
Gross Investment Income, Operating 21.7 22.0 64.9 65.7
Policy Loans        
Net Investment Income        
Gross Investment Income, Operating 5.7 5.3 17.0 16.2
Perpetual Preferred Securities        
Net Investment Income        
Gross Investment Income, Operating (0.2) (0.1) (0.2) 0.7
Private Equity Partnerships        
Net Investment Income        
Gross Investment Income, Operating [1] 36.4 21.7 80.4 65.3
Unrealized Gain (Loss) on Investments 46.5 28.8 102.0 86.4
Management Fee Expense (10.1) (7.1) (21.6) (21.1)
Other Long-term Investments        
Net Investment Income        
Gross Investment Income, Operating 3.7 4.2 12.6 23.4
Short-term Investments        
Net Investment Income        
Gross Investment Income, Operating $ 13.1 $ 25.5 $ 55.0 $ 86.6
[1] The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2026 related to private equity partnerships still held at September 30, 2026 was $46.5 million and $102.0 million, respectively, reduced by net management fees and partnership expenses of $(10.1) million and $(21.6) million, respectively. The net unrealized gain recognized in net investment income for the three and nine months ended September 30, 2025 related to private equity partnerships still held at September 30, 2025 was $28.8 million and $86.4 million, respectively, reduced by net management fees and partnership expenses of $(7.1) million and $(21.1) million, respectively. See Note 3 for further discussion of private equity partnerships.