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Fair Value Measurements - Financial Assets Measured on Recurring Basis (Details) - USD ($) | 12 Months Ended |
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, available for sale, at fair value | [1] | $ 24,200,000 | $ 14,900,000 |
Catastrophe Bonds, Fair Value Disclosure |  | 1,000,000.0 | 1,600,000 |
Derivative assets |  | 17,000,000.0 | 31,700,000 |
Fair Market Value |  | 4,978,300,000 | 4,231,100,000 |
Fair Market Value |  | 1,488,700,000 | 1,964,400,000 |
Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 111,700,000 | 117,100,000 |
Privately-held Investments, at fair value |  | 286,800,000 |  |
Total |  | 6,701,700,000 | 6,410,700,000 |
Recurring | Derivatives at fair value | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 17,000,000.0 | 31,700,000 |
Recurring | Liabilities under derivative contracts | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities under derivative contracts, fair value |  | (45,900,000) | (9,300,000) |
Recurring | Liabilities under derivative contracts | Loss Portfolio Transfer |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities under derivative contracts, fair value |  | (3,600,000) | (16,500,000) |
Recurring | Fixed income securities | Non-agency commercial mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 4,400,000 |  |
Recurring | Fixed income securities — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 4,692,200,000 | 4,122,600,000 |
Recurring | Short-term investments — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 261,900,000 | 93,600,000 |
Recurring | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,199,900,000 | 1,485,700,000 |
Catastrophe Bonds, Fair Value Disclosure |  | 1,000,000.0 | 1,600,000 |
Recurring | Short-term investments trading at fair value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,000,000.0 |  |
Recurring | Real estate fund |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 267,200,000 | 209,300,000 |
Recurring | Privately-held investments — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, available for sale, at fair value |  | 24,200,000 |  |
Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, at fair value |  | 0 |  |
Total |  | 2,207,800,000 | 1,748,400,000 |
Recurring | Level 1 | Derivatives at fair value | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 0 | 0 |
Recurring | Level 1 | Liabilities under derivative contracts | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities under derivative contracts, fair value |  | 0 | 0 |
Recurring | Level 1 | Liabilities under derivative contracts | Loss Portfolio Transfer |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities under derivative contracts, fair value |  | 0 | 0 |
Recurring | Level 1 | Fixed income securities | Non-agency commercial mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 |  |
Recurring | Level 1 | Fixed income securities — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,675,700,000 | 1,403,000,000 |
Recurring | Level 1 | Short-term investments — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 260,200,000 | 86,700,000 |
Recurring | Level 1 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 270,900,000 | 258,500,000 |
Catastrophe Bonds, Fair Value Disclosure |  | 0 | 0 |
Recurring | Level 1 | Short-term investments trading at fair value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,000,000.0 |  |
Recurring | Level 1 | Real estate fund |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Recurring | Level 1 | Privately-held investments — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, available for sale, at fair value |  | 0 |  |
Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, at fair value |  | 0 |  |
Total |  | 3,919,300,000 | 3,979,600,000 |
Recurring | Level 2 | Derivatives at fair value | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 17,000,000.0 | 31,700,000 |
Recurring | Level 2 | Liabilities under derivative contracts | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities under derivative contracts, fair value |  | (45,900,000) | (9,300,000) |
Recurring | Level 2 | Liabilities under derivative contracts | Loss Portfolio Transfer |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities under derivative contracts, fair value |  | 0 | 0 |
Recurring | Level 2 | Fixed income securities | Non-agency commercial mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 4,400,000 |  |
Recurring | Level 2 | Fixed income securities — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 3,016,500,000 | 2,719,600,000 |
Recurring | Level 2 | Short-term investments — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,700,000 | 6,900,000 |
Recurring | Level 2 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 929,000,000.0 | 1,227,200,000 |
Catastrophe Bonds, Fair Value Disclosure |  | 1,000,000.0 | 1,600,000 |
Recurring | Level 2 | Short-term investments trading at fair value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 |  |
Recurring | Level 2 | Real estate fund |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Recurring | Level 2 | Privately-held investments — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, available for sale, at fair value |  | 0 |  |
Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, at fair value |  | 286,800,000 |  |
Total |  | 307,400,000 | 473,400,000 |
Change in unrealized investment gains (losses) |  | 1,300,000 | (15,700,000) |
Fair Market Value |  | 311,000,000.0 | 489,900,000 |
Recurring | Level 3 | Liability |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities at beginning of year |  | (3,600,000) | (16,500,000) | $ (31,700,000)
Liability purchases |  | 0 | 0 |
Liability transfers |  | 0 | 0 |
Liability, Transfers out of Level 3 |  | 0 | 0 |
Liability sales |  | 0 | 0 |
Liability, increase (decrease) in fv included in net income |  | 12,900,000 | 15,200,000 |
Change in unrealized gains or losses |  | 12,900,000 | 15,200,000 |
Recurring | Level 3 | Loss Portfolio Transfer | Liability |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities at beginning of year |  | (3,600,000) | (16,500,000) | (31,700,000)
Liability purchases |  | 0 | 0 |
Liability transfers |  | 0 | 0 |
Liability, Transfers out of Level 3 |  | 0 | 0 |
Liability sales |  | 0 | 0 |
Liability, increase (decrease) in fv included in net income |  | 12,900,000 | 15,200,000 |
Change in unrealized gains or losses |  | 12,900,000 | 15,200,000 |
Recurring | Level 3 | Derivatives at fair value | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative assets |  | 0 | 0 |
Recurring | Level 3 | Liabilities under derivative contracts | Foreign exchange contracts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities under derivative contracts, fair value |  | 0 | 0 |
Recurring | Level 3 | Liabilities under derivative contracts | Loss Portfolio Transfer |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities under derivative contracts, fair value |  | (3,600,000) | (16,500,000) |
Recurring | Level 3 | Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchases and issuances |  | 71,400,000 | 113,700,000 |
Transferred in or out of Level 3 |  | 0 |  |
Transfers Into Level 3 |  | 0 | 5,300,000 |
Transfers out of Level 3 |  |  | 12,100,000 |
Settlements and sales |  | (239,700,000) | (137,200,000) |
Increase (decrease) in fair value included in net income |  | (10,600,000) | (12,800,000) |
Fair Market Value |  |  | 489,900,000 | 533,000,000.0
Recurring | Level 3 | Fixed income securities | Non-agency commercial mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 |  |
Recurring | Level 3 | Fixed income securities — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Recurring | Level 3 | Short-term investments — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Recurring | Level 3 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Catastrophe Bonds, Fair Value Disclosure |  | 0 | 0 |
Recurring | Level 3 | Short-term investments trading at fair value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 |  |
Recurring | Level 3 | Real estate fund |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Recurring | Level 3 | Commercial mortgage loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Change in unrealized investment gains (losses) |  | 0 | (17,900,000) |
Fair Market Value |  | 79,700,000 | 274,900,000 |
Recurring | Level 3 | Commercial mortgage loans | Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchases and issuances |  | 500,000 | 40,600,000 |
Transfers Into Level 3 |  | 0 | 0 |
Transfers out of Level 3 |  | 0 | 0 |
Settlements and sales |  | (184,400,000) | (61,500,000) |
Increase (decrease) in fair value included in net income |  | (11,300,000) | (16,300,000) |
Fair Market Value |  |  | 274,900,000 | 312,100,000
Recurring | Level 3 | Middle market loans and other private debt |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Change in unrealized investment gains (losses) |  | 0 | 500,000 |
Fair Market Value |  | 61,000,000.0 | 84,800,000 |
Recurring | Level 3 | Middle market loans and other private debt | Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchases and issuances |  | 400,000 | 18,300,000 |
Transfers Into Level 3 |  | 0 | 0 |
Transfers out of Level 3 |  | 0 | 0 |
Settlements and sales |  | (35,500,000) | (41,900,000) |
Increase (decrease) in fair value included in net income |  | 400,000 | 1,500,000 |
Fair Market Value |  |  | 84,800,000 | 106,900,000
Recurring | Level 3 | Global corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Change in unrealized investment gains (losses) |  | 0 | (200,000) |
Fair Market Value |  | 18,500,000 | 14,400,000 |
Recurring | Level 3 | Global corporate securities | Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchases and issuances |  | 4,400,000 | 0 |
Transfers Into Level 3 |  | 0 | 0 |
Transfers out of Level 3 |  | 0 | 0 |
Settlements and sales |  | (300,000) | (400,000) |
Increase (decrease) in fair value included in net income |  | 0 | (200,000) |
Fair Market Value |  |  | 14,400,000 | 15,000,000.0
Recurring | Level 3 | Equity Securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Change in unrealized investment gains (losses) |  |  | 0 |
Fair Market Value |  |  | 0 |
Recurring | Level 3 | Equity Securities | Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchases and issuances |  |  | 0 |
Transfers Into Level 3 |  |  | 0 |
Transfers out of Level 3 |  |  | (6,600,000) |
Settlements and sales |  |  | 0 |
Increase (decrease) in fair value included in net income |  |  | 0 |
Fair Market Value |  |  |  | 6,600,000
Recurring | Level 3 | Short-term investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Change in unrealized investment gains (losses) |  | 0 | 0 |
Fair Market Value |  | 0 | 18,000,000.0 |
Recurring | Level 3 | Short-term investments | Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchases and issuances |  | 0 | 18,200,000 |
Transfers Into Level 3 |  | 0 | 0 |
Transfers out of Level 3 |  | 0 | 0 |
Settlements and sales |  | (7,100,000) | (25,800,000) |
Increase (decrease) in fair value included in net income |  | 0 | 0 |
Fair Market Value |  |  | 18,000,000.0 | 25,600,000
Recurring | Level 3 | Asset-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Change in unrealized investment gains (losses) |  | 1,100,000 | 1,700,000 |
Fair Market Value |  | 127,600,000 | 82,900,000 |
Recurring | Level 3 | Asset-backed | Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchases and issuances |  | 56,100,000 | 21,900,000 |
Transfers Into Level 3 |  | 0 | 5,300,000 |
Transfers out of Level 3 |  | 0 | (5,500,000) |
Settlements and sales |  | (12,400,000) | (7,600,000) |
Increase (decrease) in fair value included in net income |  | 1,000,000.0 | 2,000,000.0 |
Fair Market Value |  |  | 82,900,000 | 66,800,000
Recurring | Level 3 | Privately-held investments — Available for sale |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, available for sale, at fair value |  | 24,200,000 |  |
U.S. government |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 1,480,600,000 | 1,202,600,000 |
Fair Market Value |  | 261,300,000 | 245,500,000 |
U.S. government | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,480,600,000 | 1,202,600,000 |
U.S. government | Recurring | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 261,300,000 | 245,500,000 |
U.S. government | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,480,600,000 | 1,202,600,000 |
U.S. government | Recurring | Level 1 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 261,300,000 | 245,500,000 |
U.S. government | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
U.S. government | Recurring | Level 2 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
U.S. government | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
U.S. government | Recurring | Level 3 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
U.S. agency |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 7,200,000 | 7,200,000 |
U.S. agency | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 7,200,000 | 7,200,000 |
U.S. agency | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
U.S. agency | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 7,200,000 | 7,200,000 |
U.S. agency | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Municipal |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 82,300,000 | 128,100,000 |
Fair Market Value |  | 1,600,000 | 3,100,000 |
Municipal | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 82,300,000 | 128,100,000 |
Municipal | Recurring | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,600,000 | 3,100,000 |
Municipal | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Municipal | Recurring | Level 1 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Municipal | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 82,300,000 | 128,100,000 |
Municipal | Recurring | Level 2 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,600,000 | 3,100,000 |
Municipal | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Municipal | Recurring | Level 3 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 1,986,400,000 | 1,959,300,000 |
Fair Market Value |  | 151,100,000 | 171,500,000 |
Corporate | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,986,400,000 | 1,959,300,000 |
Corporate | Recurring | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 151,100,000 | 171,500,000 |
Corporate | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Corporate | Recurring | Level 1 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Corporate | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 1,986,400,000 | 1,959,300,000 |
Corporate | Recurring | Level 2 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 151,100,000 | 171,500,000 |
Corporate | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Corporate | Recurring | Level 3 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Non-U.S. government-backed corporate |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 131,300,000 | 100,700,000 |
Fair Market Value |  | 2,800,000 | 8,300,000 |
Non-U.S. government-backed corporate | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 131,300,000 | 100,700,000 |
Non-U.S. government-backed corporate | Recurring | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 2,800,000 | 8,300,000 |
Non-U.S. government-backed corporate | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Non-U.S. government-backed corporate | Recurring | Level 1 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Non-U.S. government-backed corporate | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 131,300,000 | 100,700,000 |
Non-U.S. government-backed corporate | Recurring | Level 2 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 2,800,000 | 8,300,000 |
Non-U.S. government-backed corporate | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Non-U.S. government-backed corporate | Recurring | Level 3 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Non-U.S. government |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 246,800,000 | 273,800,000 |
Fair Market Value |  | 24,400,000 | 34,800,000 |
Non-U.S. government | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 246,800,000 | 273,800,000 |
Non-U.S. government | Recurring | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 24,400,000 | 34,800,000 |
Non-U.S. government | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 195,100,000 | 200,400,000 |
Non-U.S. government | Recurring | Level 1 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 9,600,000 | 13,000,000.0 |
Non-U.S. government | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 51,700,000 | 73,400,000 |
Non-U.S. government | Recurring | Level 2 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 14,800,000 | 21,800,000 |
Non-U.S. government | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Non-U.S. government | Recurring | Level 3 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Asset-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 234,500,000 |  |
Fair Market Value |  | 625,200,000 | 908,200,000 |
Asset-backed | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 234,500,000 |  |
Asset-backed | Recurring | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 625,200,000 | 908,200,000 |
Asset-backed | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 |  |
Asset-backed | Recurring | Level 1 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Asset-backed | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 234,500,000 |  |
Asset-backed | Recurring | Level 2 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 625,200,000 | 908,200,000 |
Asset-backed | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 |  |
Asset-backed | Recurring | Level 3 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Non-agency commercial mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 4,400,000 | 5,800,000 |
Non-agency commercial mortgage-backed securities | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 5,800,000 |
Non-agency commercial mortgage-backed securities | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 0 |
Non-agency commercial mortgage-backed securities | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 5,800,000 |
Non-agency commercial mortgage-backed securities | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 0 |
Agency residential mortgage-backed securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 518,700,000 | 445,100,000 |
Agency residential mortgage-backed securities | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 518,700,000 |  |
Agency residential mortgage-backed securities | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 |  |
Agency residential mortgage-backed securities | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 518,700,000 |  |
Agency residential mortgage-backed securities | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 |  |
Agency mortgage-backed |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 31,100,000 | 22,200,000 |
Agency mortgage-backed | Recurring | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 445,100,000 |
Agency mortgage-backed | Recurring | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 31,100,000 | 22,200,000 |
Agency mortgage-backed | Recurring | Level 1 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 0 |
Agency mortgage-backed | Recurring | Level 1 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Agency mortgage-backed | Recurring | Level 2 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 445,100,000 |
Agency mortgage-backed | Recurring | Level 2 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 31,100,000 | 22,200,000 |
Agency mortgage-backed | Recurring | Level 3 | Fixed income securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 0 |
Agency mortgage-backed | Recurring | Level 3 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
High yield loans |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 102,400,000 | 92,100,000 |
High yield loans | Recurring | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 102,400,000 | 92,100,000 |
High yield loans | Recurring | Level 1 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
High yield loans | Recurring | Level 2 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 102,400,000 | 92,100,000 |
High yield loans | Recurring | Level 3 | Fixed income securities, trading |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  | 0 | 0 |
Fixed income securities, trading | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, available for sale, at fair value |  |  | 14,900,000 |
Privately-held Investments, at fair value |  |  | 475,000,000.0 |
Fixed income securities, trading | Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, available for sale, at fair value |  |  | 0 |
Privately-held Investments, at fair value |  |  | 0 |
Fixed income securities, trading | Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, available for sale, at fair value |  |  | 0 |
Privately-held Investments, at fair value |  |  | 0 |
Fixed income securities, trading | Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Privately-held Investments, available for sale, at fair value |  |  | 14,900,000 |
Privately-held Investments, at fair value |  |  | 475,000,000.0 |
Short-term investments trading at fair value | Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 2,100,000 |
Short-term investments trading at fair value | Recurring | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 200,000 |
Short-term investments trading at fair value | Recurring | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 1,900,000 |
Short-term investments trading at fair value | Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investments, fair value |  |  | 0 |
Asset backed securities, privately-held afs | Recurring | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  | 24,200,000 | 14,900,000 |
Change in unrealized investment gains (losses) |  | 200,000 | 200,000 |
Asset backed securities, privately-held afs | Recurring | Level 3 | Assets |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Market Value |  |  | 14,900,000 | $ 0
Purchases and issuances |  | 10,000,000.0 | 14,700,000 |
Transfers Into Level 3 |  | 0 | 0 |
Transfers out of Level 3 |  | 0 | 0 |
Settlements and sales |  | 0 | 0 |
Increase (decrease) in fair value included in net income |  | $ (700,000) | $ 200,000 |
[1] | Privately-held investments, trading at fair value include related party investments totaling $73.6 million (2023 — $112.4 million). Privately-held investments, available for sale include related party investments totaling $Nil (2023 — $14.9 million).

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