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Long-Term Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Gain (Loss) on Investments |  |  | $ 117.0 | $ (5.5) | $ (1.8)
Net cash proceeds from OSTTRA joint venture transaction |  |  | 100.7 | 0.0 | 0.0
Gain on joint venture |  |  | $ 400.7 | $ 0.0 | $ 0.0
DME Holdings [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |  |
Equity Method Investments | $ 13.7 |  | $ 13.7 |  |
S&P/DJI [Member] |  |  |  |  |
Equity Method Investment, Ownership Percentage | 27.00% |  | 27.00% |  |
Equity Method Investments | $ 986.5 |  | $ 986.5 |  |
CFETS |  |  |  |  |
Equity Method Investment, Ownership Percentage | 33.00% |  | 33.00% |  |
Equity Method Investments | $ 38.8 |  | $ 38.8 |  |
OSSTRA |  |  |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  | 50.00% |  |
Equity Method Investments | $ 1,400.0 |  | $ 1,400.0 |  |
Net cash proceeds from OSTTRA joint venture transaction |  |  | 112.5 |  |
Gain on joint venture | 57.2 | $ 343.5 | 400.7 |  |
Disposal Group, Including Discontinued Operation, Intangible Assets | 1,100.0 |  | 1,100.0 |  |
Disposal Group, Including Discontinued Operation, Goodwill | 200.0 |  | 200.0 |  |
Disposal Group, Including Discontinued Operation, Deferred Tax Liabilities | $ 200.0 |  | $ 200.0 |  |

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