v3.25.1
Investments Investment Income (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Net Investment Income    
Gross Investment Income, Operating $ 537.5 $ 533.1
Less Investment Expenses 21.4 16.6
Less Investment Income on PFA Assets 2.9 3.0
Net Investment Income 513.2 513.5
Fixed Maturity Securities    
Net Investment Income    
Gross Investment Income, Operating 463.3 453.9
Derivatives    
Net Investment Income    
Gross Investment Income, Operating (4.2) 8.2
Mortgage Loans    
Net Investment Income    
Gross Investment Income, Operating 21.8 22.5
Policy Loans    
Net Investment Income    
Gross Investment Income, Operating 5.2 5.4
Perpetual Preferred Securities    
Net Investment Income    
Gross Investment Income, Operating 0.8 0.2
Private Equity Partnerships    
Net Investment Income    
Gross Investment Income, Operating [1] 18.3 20.3
Other Long-term Investments    
Net Investment Income    
Gross Investment Income, Operating 4.3 2.7
Short-term Investments    
Net Investment Income    
Gross Investment Income, Operating $ 28.0 $ 19.9
[1] The net unrealized gain recognized in net investment income for the three months ended March 31, 2025 related to private equity partnerships still held at March 31, 2025 was $26.4 million, reduced by net management fees and partnership expenses of $(8.1) million. The net unrealized gain (loss) recognized in net investment income for the three months ended March 31, 2024 related to private equity partnerships still held at March 31, 2024 was $25.0 million, reduced by net management fees and partnership expense of $(4.7) million. See Note 3 for further discussion of private equity partnerships.