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Investments - Narratives (Details) € in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) installments | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 07, 2021 USD ($) | Apr. 05, 2021 USD ($) | Apr. 05, 2021 EUR (€)
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Investments in equity securities | $ 114,600,000 | $ 91,200,000 | $ 96,500,000 |  |  |
Hy24 |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Investments in equity securities |  |  |  |  | $ 14,700,000 | € 14.2
Unfunded commitments |  |  |  |  | $ 37,200,000 | € 35.8
Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Right of refusal compensation percentage (percent) |  |  |  | 102.00% |  |
Squared Capital |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Warrant settlement in all cash | 225,000,000.0 |  |  |  |  |
Warrant settlement partial payment | $ 250,000,000.0 |  |  |  |  |
Number of installments | installments | 3 |  |  |  |  |
Warrant settlement, installment payment | $ 75,000,000.0 |  |  |  |  |
Squared Capital | Installment One |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Warrant settlement clause | $ 83,300,000 |  |  |  |  |
Anniversary Period One | Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Invested capital multiple rate |  |  |  | 1.65 |  |
Anniversary Period One | Squared Capital | Corporate Joint Venture |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Shareholder distribution threshold |  |  |  | $ 900,000,000.0 |  |
Anniversary Period Two | Corporate Joint Venture | HTEC |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Put option internal rate of return (percent) |  |  |  | 12.50% |  |
Anniversary Period Two | Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |  |
Percentage of shares callable upon exercise of call option (percent) |  |  |  | 20.00% |  |

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