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Schedule I - Summary of Investments, Other Than Investments in Related Parties (Details) $ in Millions | Dec. 31, 2025 USD ($)
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SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | $ 44,882.3 |
Amount Shown on the Balance Sheet | 43,520.8 |
Commercial Real Estate |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 2,125.4 | [1]
Amount Shown on the Balance Sheet | 2,109.5 |
United States Government and Government Agencies and Authorities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 543.8 | [1]
Fair Value of Investments | 545.0 |
Amount Shown on the Balance Sheet | 545.0 |
States, Municipalities, and Political Subdivisions |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 3,450.7 | [1]
Fair Value of Investments | 3,058.1 |
Amount Shown on the Balance Sheet | 3,058.1 |
Foreign Governments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 1,008.8 | [1]
Fair Value of Investments | 870.3 |
Amount Shown on the Balance Sheet | 870.3 |
Public Utilities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 5,048.6 | [1]
Fair Value of Investments | 4,933.9 |
Amount Shown on the Balance Sheet | 4,933.9 |
Mortgage/Asset-backed Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 1,187.3 | [1],[2]
Fair Value of Investments | 1,179.3 | [2]
Amount Shown on the Balance Sheet | 1,179.3 | [2]
All Other Corporate Bonds |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 23,500.0 | [1]
Fair Value of Investments | 22,462.1 |
Amount Shown on the Balance Sheet | 22,462.1 |
Redeemable Preferred Stocks |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 8.0 | [1]
Fair Value of Investments | 7.9 |
Amount Shown on the Balance Sheet | 7.9 |
Fixed Maturities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 34,747.2 | [1]
Fair Value of Investments | 33,056.6 |
Amount Shown on the Balance Sheet | 33,056.6 |
Policy Loans |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 3,668.1 |
Amount Shown on the Balance Sheet | 3,668.1 |
Derivatives |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 0.0 | [3]
Amount Shown on the Balance Sheet | 69.7 | [3]
Perpetual Preferred Securities |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 15.2 | [4]
Amount Shown on the Balance Sheet | 20.0 | [4]
Private Equity Funds |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 1,185.8 | [4]
Amount Shown on the Balance Sheet | 1,456.3 | [4]
Miscellaneous Long-term Investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 124.4 |
Amount Shown on the Balance Sheet | 124.4 |
Short-term Investments |  |
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items] |  |
Cost or Amortized Cost of Investments | 3,016.2 |
Amount Shown on the Balance Sheet | $ 3,016.2 |
[1] | The amortized cost for fixed maturity securities and mortgage loans represents original cost reduced by repayments, write-downs from declines in fair value, amortization of premiums, and/or accretion of discounts. The amortized cost for these investments does not include allowance for credit losses.
[2] | Includes credit-tranched securities collateralized by loan obligations, auto loans, and other asset types.
[3] | Derivatives are carried at fair value.
[4] | The difference between amortized cost and carrying value for private equity partnerships and perpetual preferred and equity securities primarily results from changes in the partnership owner's equity and the security's market valuation since acquisition, respectively.

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