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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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