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Investments - Co-Investment Agreement (Details) $ / shares in Units, € in Millions | Sep. 30, 2025 USD ($) | Apr. 30, 2025 USD ($) $ / shares | Dec. 31, 2024 USD ($) | Apr. 05, 2021 USD ($) | Apr. 05, 2021 EUR (€)
--- | --- | --- | --- | --- | ---
Debt and Equity Securities, FV-NI |  |  |  |  |
Equity method investments | $ 95,400,000 |  | $ 94,000,000.0 |  |
Equity securities, FV-NI | $ 117,900,000 |  | 114,600,000 |  |
Capital Commitment Condition One |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Investment, Type [Extensible Enumeration] |  |  |  | Common Stock | Common Stock
HTEC |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Equity investments, ownership interest (percent) | 25.00% |  |  |  |
Equity method investments | $ 70,000,000.0 |  | $ 68,900,000 |  |
Hy24 |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Equity securities, FV-NI |  |  |  | $ 19,100,000 | € 16.2
Unfunded commitment |  |  |  | $ 39,700,000 | € 33.8
Closing through third anniversary | ISQ | Corporate Joint Venture |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Shareholder distribution threshold |  | $ 900,000,000.0 |  |  |
Put option cash consideration |  | $ 323,000,000.0 |  |  |
Exercise price of option (usd per share) | $ / shares |  | $ 51.20 |  |  |
Third Anniversary | Corporate Joint Venture | HTEC |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Put option internal rate of return (percent) |  | 12.75% |  |  |
Third Anniversary | Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Percentage of shares callable upon exercise of call option (percent) |  | 85.00% |  |  |
Invested capital multiple rate |  | 1.80 |  |  |
Third Anniversary | ISQ | Corporate Joint Venture |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Percentage change in option value per share |  | 11.25% |  |  |

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