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Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Trading Investments in Fixed Income Maturities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Debt Securities, Trading, Amortized Cost | $ 1,552.7 | $ 1,576.7 | $ 1,155.5
High yield loans |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | (1.2) | (0.2) | (0.1)
Gross Unrealized Losses | 0.7 | 2.1 | 0.4
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 86.6 | 88.3 | 76.9
Debt Securities, Trading, Amortized Cost | 86.1 | 90.2 | 77.2
Fixed income securities - trading |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | (2.5) | (0.7) | (6.2)
Gross Unrealized Losses | 76.7 | 101.9 | 4.2
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 1,478.5 | 1,475.5 | 1,157.5
Debt Securities, Trading, Amortized Cost | 1,552.7 | 1,576.7 | 1,155.5
Short-term investments |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0 | 0.0
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 11.0 | 6.3 | 2.0
Debt Securities, Trading, Amortized Cost | 11.0 | 6.3 | 2.0
Catastrophe Bonds |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 2.2 | 1.9
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 2.4 | 2.9 | 3.4
Debt Securities, Trading, Amortized Cost | 2.4 | 5.1 | 5.3
Commercial mortgage loans |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | (1.3) | (0.6) | (0.4)
Gross Unrealized Losses | 11.8 | 1.1 | 0.9
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 295.0 | 312.1 | 211.5
Debt Securities, Trading, Amortized Cost | 305.5 | 312.6 | 212.0
Middle market loans |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 2.0 | 2.1 | 1.5
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 102.1 | 106.9 | 65.4
Debt Securities, Trading, Amortized Cost | 104.1 | 109.0 | 66.9
Securities, asset-backed |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 1.1 | 2.0 | 0.2
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 58.4 | 66.8 | 26.6
Debt Securities, Trading, Amortized Cost | 59.5 | 68.8 | 26.8
Global corporates securities |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 |
Gross Unrealized Losses | 0.1 | 0.1 |
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 14.8 | 15.0 |
Debt Securities, Trading, Amortized Cost | 14.9 | 15.1 |
Equity securities — Trading |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | (0.1)
Gross Unrealized Losses | 0.0 | 0.0 | 0.0
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 12.1 | 6.6 | 3.6
Debt Securities, Trading, Amortized Cost | 12.1 | 6.6 | 3.5
Short-term investments |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains |  | 0.0 |
Gross Unrealized Losses |  | 0.0 |
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) |  | 25.6 |
Debt Securities, Trading, Amortized Cost |  | 25.6 |
Privately-held investments |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | (1.3) | (0.6) | (0.5)
Gross Unrealized Losses | 15.0 | 5.3 | 2.6
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 482.4 | 533.0 | 307.1
Debt Securities, Trading, Amortized Cost | 496.1 | 537.7 | 309.2
Total - Trading |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | (3.8) | (1.3) | (6.7)
Gross Unrealized Losses | 91.7 | 109.4 | 8.7
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 1,974.3 | 2,017.7 | 1,470.0
Debt Securities, Trading, Amortized Cost | 2,062.2 | 2,125.8 | 1,472.0
U.S. government |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | (0.6)
Gross Unrealized Losses | 6.9 | 6.3 | 0.2
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 235.0 | 261.6 | 116.3
Debt Securities, Trading, Amortized Cost | 241.9 | 267.9 | 115.9
Municipal |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | (0.1)
Gross Unrealized Losses | 0.3 | 0.3 | 0.0
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 3.1 | 3.6 | 4.0
Debt Securities, Trading, Amortized Cost | 3.4 | 3.9 | 3.9
Corporate |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | (0.3) | (0.3) | (1.9)
Gross Unrealized Losses | 11.8 | 13.5 | 0.8
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 165.4 | 162.1 | 96.8
Debt Securities, Trading, Amortized Cost | 176.9 | 175.3 | 95.7
Non-U.S government |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 1.7 | 1.8 | 0.4
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 34.1 | 30.4 | 34.5
Debt Securities, Trading, Amortized Cost | 35.8 | 32.2 | 34.9
Asset-backed |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | (1.0) | (0.2) | (3.3)
Gross Unrealized Losses | 51.6 | 74.0 | 1.9
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 924.6 | 896.5 | 785.7
Debt Securities, Trading, Amortized Cost | 975.2 | 970.3 | 784.3
Agency mortgage-backed |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | (0.2)
Gross Unrealized Losses | 3.2 | 3.3 | 0.3
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 20.1 | 21.4 | 30.2
Debt Securities, Trading, Amortized Cost | 23.3 | 24.7 | 30.3
Non-U.S. government-backed corporate |  |  |
Schedule of Trading Securities and Other Trading Items [Line Items] |  |  |
Gross Unrealized Gains | 0.0 | 0.0 | 0.0
Gross Unrealized Losses | 0.5 | 0.6 | 0.2
Fixed income maturities, trading at fair value (amortized cost — $1,106.6 and $1,205.0) | 9.6 | 11.6 | 13.1
Debt Securities, Trading, Amortized Cost | $ 10.1 | $ 12.2 | $ 13.3

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