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Investments - Summary of Investment Income (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Investment income | $ (134.7) | $ (93.5) | $ (198.4) | $ (159.2) | $ (167.3)
Investment expenses | (5.3) | (4.8) | (10.3) | (11.7) | (12.7)
Net investment income (1) | 129.4 | 88.7 | 188.1 | 147.5 | 154.6
Fixed income securities |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Investment income | (55.7) | (44.5) | (95.6) | (87.2) | (106.5)
Short-term investments |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Investment income | (1.6) | 0.0 | (0.6) | (0.1) | (0.8)
Short-term investment, Trading |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Investment income | (0.1) | 0.0 | (0.1) | 0.0 | (0.5)
Fixed term deposits (included in cash and cash equivalents) |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Investment income | (17.3) | (0.5) | (6.6) | (0.7) | (6.4)
Catastrophe bonds — Trading |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Investment income | (1.1) | (0.1) | (0.3) | (0.9) | (1.4)
Privately-held investments — Trading |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Investment income | (21.5) | (8.8) | (24.3) | (18.2) | (20.9)
Other investments, at fair value |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Investment income | 10.4 | (20.7) | (13.9) | (21.9) | (2.0)
Fixed Income Securities |  |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |  |
Investment income | $ (47.8) | $ (18.9) | $ (57.0) | $ (30.2) | $ (32.8)

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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