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Fair Value Measurements Fair Value Measurements - Reconciliation of Level 3 Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Beginning of the year | $ 3,788.6 |
End of the year | $ 4,122.6 | $ 3,788.6
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Accumulated other comprehensive (loss) |
Commercial mortgage loans |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | $ 312.1 |
Balance at the end of the year | 274.9 | 312.1
Middle market loans |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 106.9 |
Balance at the end of the year | 84.8 | 106.9
Equity securities |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 6.6 |
Balance at the end of the year |  | 6.6
Short-term investments |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 25.6 |
Balance at the end of the year | 18.0 | 25.6
Recurring | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Change in unrealized investment gains (losses) | (15.7) | (4.6)
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 533.0 |
Balance at the end of the year | 489.9 | 533.0
Recurring | Level 3 | Liability |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | (31.7) | 0.0
Liability purchases | 0.0 | (17.2)
Liability transfers | 0.0 | 0.0
Liability sales | 0.0 | 0.0
Liability, increase (decrease) in fv included in net income | 15.2 | (14.5)
Balance at the end of the period | (16.5) | (31.7)
Change in unrealized gains or losses | 15.2 | 0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 | 0.0 | 0.0
Recurring | Level 3 | Liability | Loss Portfolio Transfer |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | (31.7) | 0.0
Liability purchases | 0.0 | (17.2)
Liability transfers | 0.0 | 0.0
Liability sales | 0.0 | 0.0
Liability, increase (decrease) in fv included in net income | 15.2 | (14.5)
Balance at the end of the period | (16.5) | (31.7)
Change in unrealized gains or losses | 15.2 | 0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 | 0.0 | 0.0
Recurring | Commercial mortgage loans | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Change in unrealized investment gains (losses) | (17.9) | (0.5)
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 312.1 |
Balance at the end of the year | 274.9 | 312.1
Recurring | Middle market loans | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Change in unrealized investment gains (losses) | 0.5 | (2.1)
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 106.9 |
Balance at the end of the year | 84.8 | 106.9
Recurring | Asset-backed securities | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Change in unrealized investment gains (losses) | 1.7 | (2.0)
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 66.8 |
Balance at the end of the year | 82.9 | 66.8
Recurring | Global corporate securities | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Change in unrealized investment gains (losses) | (0.2) | 0.0
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 15.0 |
Balance at the end of the year | 14.4 | 15.0
Recurring | Equity securities | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Change in unrealized investment gains (losses) | 0.0 | 0.0
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 6.6 |
Balance at the end of the year | 0.0 | 6.6
Recurring | Short-term investments | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Change in unrealized investment gains (losses) | 0.0 | 0.0
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 25.6 |
Balance at the end of the year | 18.0 | 25.6
Assets | Recurring | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 533.0 | 307.1
Purchases and issuances | 113.7 | 378.2
Transfers in/(out) | 5.3 | 0.0
Settlements and sales | (137.2) | (147.4)
Increase (decrease) in fair value included in net income | (12.8) | (4.9)
Balance at the end of the year |  | 533.0
Transfers out of Level 3 | (12.1) | 0.0
Assets | Recurring | Commercial mortgage loans | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 312.1 | 211.5
Purchases and issuances | 40.6 | 215.7
Transfers in/(out) | 0.0 | 0.0
Settlements and sales | (61.5) | (113.1)
Increase (decrease) in fair value included in net income | (16.3) | (2.0)
Balance at the end of the year |  | 312.1
Transfers out of Level 3 | 0.0 | 0.0
Assets | Recurring | Middle market loans | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 106.9 | 65.3
Purchases and issuances | 18.3 | 61.8
Transfers in/(out) | 0.0 | 0.0
Settlements and sales | (41.9) | (19.3)
Increase (decrease) in fair value included in net income | 1.5 | (0.9)
Balance at the end of the year |  | 106.9
Transfers out of Level 3 | 0.0 | 0.0
Assets | Recurring | Asset-backed securities | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 66.8 | 26.7
Purchases and issuances | 21.9 | 54.5
Transfers in/(out) | 5.3 | 0.0
Settlements and sales | (7.6) | (12.6)
Increase (decrease) in fair value included in net income | 2.0 | (1.8)
Balance at the end of the year |  | 66.8
Transfers out of Level 3 | (5.5) | 0.0
Assets | Recurring | Global corporate securities | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 15.0 | 0.0
Purchases and issuances | 0.0 | 15.1
Transfers in/(out) | 0.0 | 0.0
Settlements and sales | (0.4) | 0.0
Increase (decrease) in fair value included in net income | (0.2) | (0.1)
Balance at the end of the year |  | 15.0
Transfers out of Level 3 | 0.0 | 0.0
Assets | Recurring | Equity securities | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 6.6 | 3.6
Purchases and issuances | 0.0 | 5.5
Transfers in/(out) | 0.0 | 0.0
Settlements and sales | 0.0 | (2.4)
Increase (decrease) in fair value included in net income | 0.0 | (0.1)
Balance at the end of the year |  | 6.6
Transfers out of Level 3 | (6.6) | 0.0
Assets | Recurring | Short-term investments | Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Calculation [Roll Forward] |  |
Balance at the beginning of the year | 25.6 | 0.0
Purchases and issuances | 18.2 | 25.6
Transfers in/(out) | 0.0 | 0.0
Settlements and sales | (25.8) | 0.0
Increase (decrease) in fair value included in net income | 0.0 | 0.0
Balance at the end of the year |  | 25.6
Transfers out of Level 3 | $ 0.0 | $ 0.0

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- Definition Amount of transfers of financial instrument classified as a liability into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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