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Long-Term Investments (Details) - USD ($) shares in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Gain (Loss) on Investments		$ 3,600,000	$ 72,100,000	$ 4,800,000
DME Holdings [Member]
Equity Method Investment, Ownership Percentage	50.00%	33.00%
Equity Method Investments		$ 11,600,000
Gain (Loss) on Disposition of Stock in Subsidiary or Equity Method Investee		$ 9,200,000
Equity Method Investment, Additional Information	3.5 million	15.5 million
Sale of Stock, Number of Shares Issued in Transaction	3.5	15.5
OSSTRA
Equity Method Investment, Ownership Percentage		50.00%
Equity Method Investments		$ 1,200,000,000
S&P/DJI [Member]
Equity Method Investment, Ownership Percentage		27.00%
Equity Method Investments		$ 1,300,000,000
Payments to Acquire Investments		$ 410,000,000
CFETS
Equity Method Investment, Ownership Percentage		33.00%
Equity Method Investments		$ 58,400,000

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of realized and unrealized gain (loss) on investment.

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