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Fair Value of Financial Instruments - Transfers Between Different Fair Value Levels (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
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
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Net investment losses | Net investment losses
Financial Assets |  |
Beginning balance | $ 425.3 | $ 371.4
Transfers into Level 3 | 79.4 | 193.8
Transfers out of Level 3 | (3.7) | (42.8)
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.4 | (3.4)
Net unrealized investment gains (losses) included in OCI | (0.8) | (38.2)
Purchases | 76.0 | 33.2
Issuances | 0.0 | 0.0
Sales | (7.7) | (4.8)
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (50.4) | (83.9)
Ending balance | 518.5 | 425.3
Financial Liabilities |  |
Beginning balance | 91.3 | 111.4
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 related to financial liabilities | $ 1.3 | $ (14.8)
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 | $ 0.4 | $ (2.6)
Purchases | 0.0 | 0.0
Issuances | 8.0 | 7.4
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (18.6) | (10.1)
Ending balance | 82.4 | 91.3
Municipal bonds |  |
Financial Assets |  |
Beginning balance | 54.4 | 60.8
Transfers into Level 3 | 0.0 | 0.6
Transfers out of Level 3 | 0.0 | (3.2)
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.0 | 0.0
Net unrealized investment gains (losses) included in OCI | 11.3 | (10.5)
Purchases | 9.5 | 0.2
Issuances | 0.0 | 0.0
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (1.2) | 6.5
Ending balance | 74.0 | 54.4
Corporate bonds |  |
Financial Assets |  |
Beginning balance | 261.3 | 210.3
Transfers into Level 3 | 76.5 | 157.9
Transfers out of Level 3 | (3.7) | (34.8)
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.0 | 0.0
Net unrealized investment gains (losses) included in OCI | (17.1) | (16.1)
Purchases | 64.5 | 20.2
Issuances | 0.0 | 0.0
Sales | (7.7) | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (31.3) | (76.2)
Ending balance | 342.5 | 261.3
Other asset-backed securities |  |
Financial Assets |  |
Beginning balance | 107.6 | 98.9
Transfers into Level 3 | 0.8 | 34.5
Transfers out of Level 3 | 0.0 | (4.8)
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.0 | (3.3)
Net unrealized investment gains (losses) included in OCI | 5.0 | (11.6)
Purchases | 2.0 | 12.8
Issuances | 0.0 | 0.0
Sales | 0.0 | (4.8)
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (17.9) | (14.1)
Ending balance | 97.5 | 107.6
Total |  |
Financial Assets |  |
Beginning balance | 423.3 | 370.0
Transfers into Level 3 | 77.3 | 193.0
Transfers out of Level 3 | (3.7) | (42.8)
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.0 | (3.3)
Net unrealized investment gains (losses) included in OCI | (0.8) | (38.2)
Purchases | 76.0 | 33.2
Issuances | 0.0 | 0.0
Sales | (7.7) | (4.8)
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (50.4) | (83.8)
Ending balance | 514.0 | 423.3
Equity securities |  |
Financial Assets |  |
Beginning balance | 2.0 | 1.4
Transfers into Level 3 | 2.1 | 0.8
Transfers out of Level 3 | 0.0 | 0.0
Total gains or losses |  |
Net investment gains (losses) included in net income | 0.4 | (0.1)
Net unrealized investment gains (losses) included in OCI | 0.0 | 0.0
Purchases | 0.0 | 0.0
Issuances | 0.0 | 0.0
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | 0.0 | (0.1)
Ending balance | $ 4.5 | $ 2.0

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