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Fair Value of Financial Instruments - Transfers Between Different Fair Value Levels (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
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 | $ 371.4 | $ 355.1
Transfers into Level 3 | 193.8 | 172.6
Transfers out of Level 3 | (42.8) | (83.6)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (3.4) | (8.1)
Net unrealized investment gains (losses) included in OCI | (38.2) | 6.3
Purchases | 33.2 | 0.0
Issuances | 0.0 | 0.0
Sales | (4.8) | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (83.9) | (70.9)
Ending balance | 425.3 | 371.4
Financial Liabilities |  |
Beginning balance | 106.6 | 104.5
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 | (12.9) | 10.0
Net unrealized investment gains (losses) included in OCI | 0.0 | 0.0
Purchases | 0.0 | 0.0
Issuances | 7.4 | 4.9
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (10.1) | (12.8)
Ending balance | 91.0 | 106.6
Municipal bonds |  |
Financial Assets |  |
Beginning balance | 60.8 | 59.6
Transfers into Level 3 | 0.6 | 18.6
Transfers out of Level 3 | (3.2) | 0.0
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | 0.0 | 0.0
Net unrealized investment gains (losses) included in OCI | (10.5) | (2.5)
Purchases | 0.2 | 0.0
Issuances | 0.0 | 0.0
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | 6.5 | (14.9)
Ending balance | 54.4 | 60.8
Corporate bonds |  |
Financial Assets |  |
Beginning balance | 210.3 | 155.8
Transfers into Level 3 | 157.9 | 131.7
Transfers out of Level 3 | (34.8) | (64.4)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | 0.0 | 0.0
Net unrealized investment gains (losses) included in OCI | (16.1) | 0.0
Purchases | 20.2 | 0.0
Issuances | 0.0 | 0.0
Sales | 0.0 | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (76.2) | (12.8)
Ending balance | 261.3 | 210.3
Other asset-backed securities |  |
Financial Assets |  |
Beginning balance | 98.9 | 139.4
Transfers into Level 3 | 34.5 | 21.3
Transfers out of Level 3 | (4.8) | (19.2)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (3.3) | (8.2)
Net unrealized investment gains (losses) included in OCI | (11.6) | 8.8
Purchases | 12.8 | 0.0
Issuances | 0.0 | 0.0
Sales | (4.8) | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (14.1) | (43.2)
Ending balance | 107.6 | 98.9
Total |  |
Financial Assets |  |
Beginning balance | 370.0 | 354.8
Transfers into Level 3 | 193.0 | 171.6
Transfers out of Level 3 | (42.8) | (83.6)
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (3.3) | (8.2)
Net unrealized investment gains (losses) included in OCI | (38.2) | 6.3
Purchases | 33.2 | 0.0
Issuances | 0.0 | 0.0
Sales | (4.8) | 0.0
Settlements | 0.0 | 0.0
Paydowns, maturities and distributions | (83.8) | (70.9)
Ending balance | 423.3 | 370.0
Equity securities |  |
Financial Assets |  |
Beginning balance | 1.4 | 0.3
Transfers into Level 3 | 0.8 | 1.0
Transfers out of Level 3 | 0.0 | 0.0
Total gains or losses |  |
Net investment gains (losses) included in net income related to financial assets | (0.1) | 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 | (0.1) | 0.0
Ending balance | $ 2.0 | $ 1.4

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