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Fair Value Disclosures - Fair Value for Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Financial Assets |  |
Fixed maturity securities, fair value | $ 8,783.8 | $ 8,577.7
Equity securities at fair value | 197.3 | 207.1
Other investments | 601.5 | 573.0
States, municipalities and political subdivisions |  |
Financial Assets |  |
Fixed maturity securities, fair value | 94.8 | 96.1
Foreign governments |  |
Financial Assets |  |
Fixed maturity securities, fair value | 615.0 | 593.9
Asset-backed |  |
Financial Assets |  |
Fixed maturity securities, fair value | 850.1 | 845.7
Commercial mortgage-backed |  |
Financial Assets |  |
Fixed maturity securities, fair value | 419.0 | 417.4
Residential mortgage-backed |  |
Financial Assets |  |
Fixed maturity securities, fair value | 1,001.5 | 954.7
U.S. corporate |  |
Financial Assets |  |
Fixed maturity securities, fair value | 3,970.5 | 3,877.6
Foreign corporate |  |
Financial Assets |  |
Fixed maturity securities, fair value | 1,769.8 | 1,729.4
Recurring |  |
Financial Assets |  |
Short-term investments | 278.0 | 336.3
Other investments | 69.5 | 72.2
Cash equivalents | 1,156.7 | 1,349.3
Other assets | 5.0 | 6.4
Total financial assets | 10,490.3 | 10,549.0
Financial Liabilities |  |
Other liabilities | 93.6 | 85.0
Total financial liabilities | 93.6 | 85.0
Recurring | Level 1 |  |
Financial Assets |  |
Short-term investments | 269.8 | 329.0
Other investments | 69.5 | 72.2
Cash equivalents | 1,141.9 | 1,335.5
Other assets | 0.0 | 0.0
Total financial assets | 1,499.7 | 1,754.8
Financial Liabilities |  |
Other liabilities | 61.9 | 62.7
Total financial liabilities | 61.9 | 62.7
Recurring | Level 2 |  |
Financial Assets |  |
Short-term investments | 8.2 | 7.3
Other investments | 0.0 | 0.0
Cash equivalents | 14.8 | 13.8
Other assets | 0.0 | 0.0
Total financial assets | 8,740.7 | 8,563.0
Financial Liabilities |  |
Other liabilities | 0.0 | 0.0
Total financial liabilities | 0.0 | 0.0
Recurring | Level 3 |  |
Financial Assets |  |
Short-term investments | 0.0 | 0.0
Other investments | 0.0 | 0.0
Cash equivalents | 0.0 | 0.0
Other assets | 5.0 | 6.4
Total financial assets | 249.9 | 231.2
Financial Liabilities |  |
Other liabilities | 31.7 | 22.3
Total financial liabilities | 31.7 | 22.3
Recurring | U.S. government and government agencies and authorities |  |
Financial Assets |  |
Fixed maturity securities, fair value | 63.1 | 62.9
Recurring | U.S. government and government agencies and authorities | Level 1 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | U.S. government and government agencies and authorities | Level 2 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 63.1 | 62.9
Recurring | U.S. government and government agencies and authorities | Level 3 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | States, municipalities and political subdivisions |  |
Financial Assets |  |
Fixed maturity securities, fair value | 94.8 | 96.1
Recurring | States, municipalities and political subdivisions | Level 1 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | States, municipalities and political subdivisions | Level 2 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 94.8 | 96.1
Recurring | States, municipalities and political subdivisions | Level 3 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | Foreign governments |  |
Financial Assets |  |
Fixed maturity securities, fair value | 615.0 | 593.9
Recurring | Foreign governments | Level 1 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | Foreign governments | Level 2 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 615.0 | 593.9
Recurring | Foreign governments | Level 3 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | Asset-backed |  |
Financial Assets |  |
Fixed maturity securities, fair value | 850.1 | 845.7
Recurring | Asset-backed | Level 1 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | Asset-backed | Level 2 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 713.4 | 715.9
Recurring | Asset-backed | Level 3 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 136.7 | 129.8
Recurring | Commercial mortgage-backed |  |
Financial Assets |  |
Fixed maturity securities, fair value | 419.0 | 417.4
Recurring | Commercial mortgage-backed | Level 1 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | Commercial mortgage-backed | Level 2 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 419.0 | 417.4
Recurring | Commercial mortgage-backed | Level 3 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | Residential mortgage-backed |  |
Financial Assets |  |
Fixed maturity securities, fair value | 1,001.5 | 954.7
Recurring | Residential mortgage-backed | Level 1 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | Residential mortgage-backed | Level 2 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 1,001.5 | 954.7
Recurring | Residential mortgage-backed | Level 3 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | U.S. corporate |  |
Financial Assets |  |
Fixed maturity securities, fair value | 3,970.5 | 3,877.6
Recurring | U.S. corporate | Level 1 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | U.S. corporate | Level 2 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 3,897.8 | 3,812.0
Recurring | U.S. corporate | Level 3 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 72.7 | 65.6
Recurring | Foreign corporate |  |
Financial Assets |  |
Fixed maturity securities, fair value | 1,769.8 | 1,729.4
Recurring | Foreign corporate | Level 1 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 0.0 | 0.0
Recurring | Foreign corporate | Level 2 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 1,756.3 | 1,721.5
Recurring | Foreign corporate | Level 3 |  |
Financial Assets |  |
Fixed maturity securities, fair value | 13.5 | 7.9
Recurring | Mutual funds |  |
Financial Assets |  |
Equity securities at fair value | 37.9 | 37.3
Recurring | Mutual funds | Level 1 |  |
Financial Assets |  |
Equity securities at fair value | 16.3 | 16.1
Recurring | Mutual funds | Level 2 |  |
Financial Assets |  |
Equity securities at fair value | 0.0 | 0.0
Recurring | Mutual funds | Level 3 |  |
Financial Assets |  |
Equity securities at fair value | 21.6 | 21.2
Recurring | Common stocks |  |
Financial Assets |  |
Equity securities at fair value | 2.2 | 2.0
Recurring | Common stocks | Level 1 |  |
Financial Assets |  |
Equity securities at fair value | 2.2 | 2.0
Recurring | Common stocks | Level 2 |  |
Financial Assets |  |
Equity securities at fair value | 0.0 | 0.0
Recurring | Common stocks | Level 3 |  |
Financial Assets |  |
Equity securities at fair value | 0.0 | 0.0
Recurring | Non-redeemable preferred stocks |  |
Financial Assets |  |
Equity securities at fair value | 157.2 | 167.8
Recurring | Non-redeemable preferred stocks | Level 1 |  |
Financial Assets |  |
Equity securities at fair value | 0.0 | 0.0
Recurring | Non-redeemable preferred stocks | Level 2 |  |
Financial Assets |  |
Equity securities at fair value | 156.8 | 167.5
Recurring | Non-redeemable preferred stocks | Level 3 |  |
Financial Assets |  |
Equity securities at fair value | $ 0.4 | $ 0.3

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