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Long-Term Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gain (Loss) on Investments	$ 4,800,000	$ 117,000,000.0	$ (5,500,000)
Net cash proceeds from OSTTRA joint venture transaction	0	100,700,000	0
Gain on joint venture	$ 0	$ (400,700,000)	$ 0
DME Holdings [Member]
Equity Method Investment, Ownership Percentage	50.00%
Equity Method Investments	$ 13,300,000
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	$ 45,000,000

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