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Fair Value Measurements - Fair Value Inputs (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instrument Classified as Cash Flow Hedge | $ 3.0 |
Total Assets | 6,956.2 | $ 6,628.1
Total Liabilities |  | (3.7)
Investments in Fixed Maturities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 6,669.1 | 6,409.6
U.S. Government and Government Agencies and Authorities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 593.0 | 486.8
States and Political Subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 1,219.9 | 1,233.2
Foreign Governments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 6.7 | 6.6
Bonds and Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 3,599.6 | 3,519.6
Redeemable Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 10.1 | 8.9
Collateralized Loan Obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 868.3 | 741.5
Other Mortgage- and Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 371.5 | 413.0
Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 284.1 | 218.5
Exchange Traded Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 10.2 | 10.9
Limited Liability Companies and Limited Partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 198.4 | 183.6
Designated as Hedging Instrument |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instruments Designated as Cash Flow Hedges |  | (3.7)
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instrument Classified as Cash Flow Hedge | 0.0 |
Total Assets | 163.7 | 98.1
Total Liabilities |  | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Investments in Fixed Maturities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 102.9 | 86.8
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Government and Government Agencies and Authorities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 102.9 | 86.8
Quoted Prices in Active Markets for Identical Assets (Level 1) | States and Political Subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Governments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Bonds and Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Redeemable Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized Loan Obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Mortgage- and Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 60.8 | 11.3
Quoted Prices in Active Markets for Identical Assets (Level 1) | Exchange Traded Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 10.2 | 10.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Limited Liability Companies and Limited Partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Designated as Hedging Instrument |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instruments Designated as Cash Flow Hedges |  | 0.0
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instrument Classified as Cash Flow Hedge | 3.0 |
Total Assets | 6,247.9 | 6,137.4
Total Liabilities |  | (3.7)
Significant Other Observable Inputs (Level 2) | Investments in Fixed Maturities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 6,224.8 | 6,117.6
Significant Other Observable Inputs (Level 2) | U.S. Government and Government Agencies and Authorities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 490.1 | 400.0
Significant Other Observable Inputs (Level 2) | States and Political Subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 1,219.7 | 1,231.4
Significant Other Observable Inputs (Level 2) | Foreign Governments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 6.7 | 6.6
Significant Other Observable Inputs (Level 2) | Bonds and Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 3,338.0 | 3,325.4
Significant Other Observable Inputs (Level 2) | Redeemable Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 5.8 | 4.7
Significant Other Observable Inputs (Level 2) | Collateralized Loan Obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 815.5 | 741.5
Significant Other Observable Inputs (Level 2) | Other Mortgage- and Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 349.0 | 408.0
Significant Other Observable Inputs (Level 2) | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 20.1 | 19.8
Significant Other Observable Inputs (Level 2) | Exchange Traded Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | Limited Liability Companies and Limited Partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Significant Other Observable Inputs (Level 2) | Designated as Hedging Instrument |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instruments Designated as Cash Flow Hedges |  | (3.7)
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instrument Classified as Cash Flow Hedge | 0.0 |
Total Assets | 346.2 | 209.0
Total Liabilities |  | 0.0
Significant Unobservable Inputs (Level 3) | Investments in Fixed Maturities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 341.4 | 205.2
Significant Unobservable Inputs (Level 3) | U.S. Government and Government Agencies and Authorities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | States and Political Subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.2 | 1.8
Significant Unobservable Inputs (Level 3) | Foreign Governments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Bonds and Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 261.6 | 194.2
Significant Unobservable Inputs (Level 3) | Redeemable Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 4.3 | 4.2
Significant Unobservable Inputs (Level 3) | Collateralized Loan Obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 52.8 | 0.0
Significant Unobservable Inputs (Level 3) | Other Mortgage- and Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 22.5 | 5.0
Significant Unobservable Inputs (Level 3) | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 4.8 | 3.8
Significant Unobservable Inputs (Level 3) | Exchange Traded Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Limited Liability Companies and Limited Partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Significant Unobservable Inputs (Level 3) | Designated as Hedging Instrument |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instruments Designated as Cash Flow Hedges |  | 0.0
Finance, Insurance and Real Estate | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 15.7 | 13.1
Finance, Insurance and Real Estate | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.3
Finance, Insurance and Real Estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Finance, Insurance and Real Estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.3
Finance, Insurance and Real Estate | Significant Other Observable Inputs (Level 2) | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 13.1 | 13.1
Finance, Insurance and Real Estate | Significant Other Observable Inputs (Level 2) | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Finance, Insurance and Real Estate | Significant Unobservable Inputs (Level 3) | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 2.6 | 0.0
Finance, Insurance and Real Estate | Significant Unobservable Inputs (Level 3) | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Other Industries | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 7.5 | 9.5
Other Industries | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 52.3 | 1.1
Other Industries | Quoted Prices in Active Markets for Identical Assets (Level 1) | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Other Industries | Quoted Prices in Active Markets for Identical Assets (Level 1) | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 50.6 | 0.1
Other Industries | Significant Other Observable Inputs (Level 2) | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 7.0 | 6.7
Other Industries | Significant Other Observable Inputs (Level 2) | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Other Industries | Significant Unobservable Inputs (Level 3) | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.5 | 2.8
Other Industries | Significant Unobservable Inputs (Level 3) | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 1.7 | 1.0
Measured at Net Asset Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instrument Classified as Cash Flow Hedge | 0.0 |
Total Assets | 198.4 | 183.6
Total Liabilities |  | 0.0
Measured at Net Asset Value | Investments in Fixed Maturities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Measured at Net Asset Value | U.S. Government and Government Agencies and Authorities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Measured at Net Asset Value | States and Political Subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Measured at Net Asset Value | Foreign Governments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Measured at Net Asset Value | Bonds and Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Measured at Net Asset Value | Redeemable Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Measured at Net Asset Value | Collateralized Loan Obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Measured at Net Asset Value | Other Mortgage- and Asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Fixed Maturities | 0.0 | 0.0
Measured at Net Asset Value | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 198.4 | 183.6
Measured at Net Asset Value | Exchange Traded Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Measured at Net Asset Value | Limited Liability Companies and Limited Partnerships |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 198.4 | 183.6
Measured at Net Asset Value | Designated as Hedging Instrument |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instruments Designated as Cash Flow Hedges |  | 0.0
Measured at Net Asset Value | Finance, Insurance and Real Estate | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Measured at Net Asset Value | Finance, Insurance and Real Estate | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Measured at Net Asset Value | Other Industries | Preferred Stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | 0.0 | 0.0
Measured at Net Asset Value | Other Industries | Common Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total Investments in Equity Securities at Fair Value | $ 0.0 | $ 0.0

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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4B + Details
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