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Fair Value of Financial Instruments - Transfers Between Different Fair Value Levels (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment losses | Net investment losses
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] | Change in net unrealized investment gains (losses) on fixed maturity securities | Change in net unrealized investment gains (losses) on fixed maturity securities
Financial Assets |  |
Beginning balance | $ 518.5 | $ 425.3
Transfers into Level 3 | 48.7 | 79.4
Transfers out of Level 3 | (12.4) | (3.7)
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.9 | 0.4
Net unrealized investment gains (losses) included in OCI | 3.7 | (0.8)
Purchases | 88.3 | 76.0
Issuances | 0.0 | 0.0
Sales | (46.4) | (7.7)
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (68.3) | (50.4)
Ending balance | 533.0 | 518.5
Financial Liabilities |  |
Beginning balance | 82.4 | 91.3
Transfers into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0
Total gains or losses |  |
Net investment (gains) losses included in net income related to financial liabilities | $ 5.4 | $ 1.3
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Liability, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration] | Change in net unrealized investment gains (losses) on fixed maturity securities | Change in net unrealized investment gains (losses) on fixed maturity securities
Net unrealized investment gains (losses) included in OCI | $ 0.0 | $ 0.4
Purchases | 0.0 | 0.0
Issuances | 5.4 | 8.0
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (17.7) | (18.6)
Ending balance | 75.5 | 82.4
Municipal Bonds |  |
Financial Assets |  |
Beginning balance | 74.0 | 54.4
Transfers into Level 3 | 0.0 | 0.0
Transfers out of Level 3 | 0.0 | 0.0
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.0 | 0.0
Net unrealized investment gains (losses) included in OCI | (2.1) | 11.3
Purchases | 4.2 | 9.5
Issuances | 0.0 | 0.0
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (1.2) | (1.2)
Ending balance | 74.9 | 74.0
Corporate Bonds |  |
Financial Assets |  |
Beginning balance | 342.5 | 261.3
Transfers into Level 3 | 11.8 | 76.5
Transfers out of Level 3 | (8.4) | (3.7)
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.0 | 0.0
Net unrealized investment gains (losses) included in OCI | 5.7 | (17.1)
Purchases | 81.2 | 64.5
Issuances | 0.0 | 0.0
Sales | (46.4) | (7.7)
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (35.1) | (31.3)
Ending balance | 351.3 | 342.5
Mortgage-Backed and Other Asset- Backed Securities |  |
Financial Assets |  |
Beginning balance | 97.5 | 107.6
Transfers into Level 3 | 8.0 | 0.8
Transfers out of Level 3 | (4.0) | 0.0
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.3 | 0.0
Net unrealized investment gains (losses) included in OCI | 0.1 | 5.0
Purchases | 1.7 | 2.0
Issuances | 0.0 | 0.0
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (29.9) | (17.9)
Ending balance | 73.7 | 97.5
Total Fixed Maturity Securities |  |
Financial Assets |  |
Beginning balance | 514.0 | 423.3
Transfers into Level 3 | 19.8 | 77.3
Transfers out of Level 3 | (12.4) | (3.7)
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.3 | 0.0
Net unrealized investment gains (losses) included in OCI | 3.7 | (0.8)
Purchases | 87.1 | 76.0
Issuances | 0.0 | 0.0
Sales | (46.4) | (7.7)
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (66.2) | (50.4)
Ending balance | 499.9 | 514.0
Equity Securities & Limited Partnership Interests |  |
Financial Assets |  |
Beginning balance | 4.5 | 2.0
Transfers into Level 3 | 28.9 | 2.1
Transfers out of Level 3 | 0.0 | 0.0
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.6 | 0.4
Net unrealized investment gains (losses) included in OCI | 0.0 | 0.0
Purchases | 1.2 | 0.0
Issuances | 0.0 | 0.0
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (2.1) | 0.0
Ending balance | $ 33.1 | $ 4.5

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