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Long-Term Investments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Gain (Loss) on Investments | $ 72,100,000 | $ 4,800,000 | $ 117,000,000.0
Net cash proceeds from OSTTRA joint venture transaction | 0 | 0 | 100,700,000
Gain on joint venture | $ 0 | $ 0 | $ 400,700,000
DME Holdings [Member] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Equity Method Investments | $ 13,800,000 |  |
OSSTRA |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Equity Method Investments | $ 1,300,000,000 |  |
Net cash proceeds from OSTTRA joint venture transaction | 112,500,000 |  |
Gain on joint venture | $ 400,700,000 |  |
S&P/DJI [Member] |  |  |
Equity Method Investment, Ownership Percentage | 27.00% |  |
Equity Method Investments | $ 1,400,000,000 |  |
Payments to Acquire Investments | $ 410,000,000 |  |
CFETS |  |  |
Equity Method Investment, Ownership Percentage | 33.00% |  |
Equity Method Investments | $ 51,300,000 |  |

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