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Commitments, Contingencies and Other Items - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Commitments and Contingencies [Line Items] |  |
Initial commitments | $ 3,600.0 | $ 2,900.0
Fulfilled commitments | 2,000.0 | 1,700.0
Unfunded commitments | $ 1,600.0 | $ 1,200.0
Operating lease, weighted average lease term | 6 years 10 months 24 days |
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other assets | Other assets
Operating Lease, Liability, Statement of Financial Position [Extensible List] | Other liabilities | Other liabilities
Operating lease, right-of-use asset | $ 72.9 | $ 66.6
Operating lease, liability | 103.9 | 67.1
Operating lease, expense | $ 12.8 | $ 8.8
Lessee, finance lease, term of contract | 20 years |
Lessee, finance lease, renewal term | 30 years |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other assets | Other assets
Finance Lease, Liability, Statement of Financial Position [Extensible List] | Other liabilities | Other liabilities
Finance lease, right-of-use asset | $ 16.6 | $ 17.1
Finance lease, liability | 21.5 | 22.0
Letter of Credit |  |
Commitments and Contingencies [Line Items] |  |
Letters of credit outstanding | 1,600.0 |
Letter of Credit | Top Layer Reinsurance Ltd. |  |
Commitments and Contingencies [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 37.5 |
Letter of Credit | Capital Support Agreement | Top Layer Reinsurance Ltd. |  |
Commitments and Contingencies [Line Items] |  |
Maximum mandatory capital contribution in the event of loss that reduced capital and surplus below specified level | 50.0 |
Interest Expense |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, interest expense | 2.2 | 2.2
Other income (loss) |  |
Commitments and Contingencies [Line Items] |  |
Finance lease, right-of-use asset, amortization | $ 0.5 | $ 0.5

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