Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Total revenues	$ 974.5	$ 1,010.8
Cost of revenues:
Total cost of revenues	556.4	645.3
Revenues less cost of revenues	418.1	365.5
Operating expenses:
Compensation and benefits	81.2	72.3
Depreciation and amortization	40.9	42.0
Technology support services	19.2	17.2
Professional fees and outside services	19.7	15.6
Travel and promotional expenses	2.9	1.6
Facilities costs	6.5	5.3
Acquisition-related costs	2.0	3.4
Other expenses	6.0	3.5
Total operating expenses	178.4	160.9
Operating income	239.7	204.6
Non-operating (expenses) income:
Interest expense, net	(10.8)	(12.3)
Other (expense) income, net	(4.0)	0.6
Income before income tax provision	224.9	192.9
Income tax provision	115.3	55.7
Net income	109.6	137.2
Net income allocated to participating securities	(0.4)	(0.4)
Net income allocated to common stockholders	$ 109.2	$ 136.8
Basic earnings per share (in dollars per share)	$ 1.02	$ 1.27
Diluted earnings per share (in dollars per share)	$ 1.02	$ 1.27
Basic weighted average shares outstanding (in shares)	106.6	107.3
Diluted weighted average shares outstanding (in shares)	106.8	107.4
Cash and spot markets
Revenues:
Total revenues	$ 461.9	$ 548.9
Data and access solutions
Revenues:
Total revenues	118.9	100.6
Derivatives markets
Revenues:
Total revenues	393.7	361.3
Liquidity payments
Cost of revenues:
Total cost of revenues	467.5	501.8
Routing and clearing
Cost of revenues:
Total cost of revenues	22.3	27.1
Section 31 fees
Cost of revenues:
Total cost of revenues	35.7	91.9
Royalty fees and other cost of revenues
Cost of revenues:
Total cost of revenues	$ 30.9	$ 24.5