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Investments - Co-Investment Agreement (Details) € in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 07, 2021 USD ($) | Apr. 05, 2021 USD ($) | Apr. 05, 2021 EUR (€)
--- | --- | --- | --- | --- | ---
Debt and Equity Securities, FV-NI |  |  |  |  |
Equity method investments | $ 106,700,000 | $ 109,900,000 |  |  |
Investments in equity securities | 95,300,000 | 91,200,000 |  |  |
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 method investments | $ 79,300,000 | $ 82,300,000 |  |  |
Hy24 |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Investments in equity securities |  |  |  | $ 10,400,000 | € 9.7
Unfunded commitment |  |  |  | $ 43,600,000 | € 40.3
Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Right of refusal compensation percentage (percent) |  |  | 102.00% |  |
Closing through third anniversary | Corporate Joint Venture | HTEC |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Put option internal rate of return (percent) |  |  | 10.00% |  |
Closing through third anniversary | Corporate Joint Venture | HTEC | Common Stock |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Invested capital multiple rate |  |  | 1.65 |  |
Closing through third anniversary | ISQ | Corporate Joint Venture |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Shareholder distribution threshold |  |  | $ 900,000,000.0 |  |
After third anniversary | Corporate Joint Venture | HTEC |  |  |  |  |
Debt and Equity Securities, FV-NI |  |  |  |  |
Put option internal rate of return (percent) |  |  | 12.50% |  |
After third anniversary | 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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