Consolidated Balance Sheets - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents		$ 1,406.3	$ 1,903.6
Marketable securities		82.8	90.1
Accounts receivable, net of allowance of $3.5 and $2.2		386.3	359.7
Other current assets (includes $1,622.1 and $0 in restricted cash)		1,795.5	367.8
Performance bonds and guaranty fund contributions		37,843.9	44,185.3
Total current assets		41,514.8	46,906.5
Property, net of accumulated depreciation and amortization of $736.8 and $676.6		362.7	399.7
Intangible assets—trading products	[1]	17,175.3	17,175.3
Intangible assets—other, net		2,268.4	2,346.3
Goodwill		7,569.0	7,569.0
Other assets (includes $1.3 and $2.4 in restricted cash)		1,473.9	1,394.4
Total Assets		70,364.1	75,791.2
Liabilities and Equity
Accounts payable		53.9	31.3
Other current liabilities		256.3	1,456.3
Performance bonds and guaranty fund contributions		37,843.9	44,185.3
Total current liabilities		38,154.1	45,672.9
Long-term debt		3,419.6	2,233.1
Deferred income tax liabilities, net		4,882.7	4,857.7
Other liabilities		612.0	615.7
Total Liabilities		47,068.4	53,379.4
Shareholders' Equity:
Preferred stock, $0.01 par value, 10,000 shares authorized at September 30, 2018 and December 31, 2017; none issued		0.0	0.0
Additional paid-in capital		17,927.2	17,896.9
Retained earnings		5,346.4	4,497.2
Accumulated other comprehensive income (loss)		18.7	14.3
Total Shareholders’ Equity		23,295.7	22,411.8
Total Liabilities and Equity		70,364.1	75,791.2
Class A Common Stock [Member]
Shareholders' Equity:
Common stock		3.4	3.4
Class B Common Stock [Member]
Shareholders' Equity:
Common stock		$ 0.0	$ 0.0

[1] )Trading products represent futures and options products acquired in our business combinations with CBOT Holdings, Inc., NYMEX Holdings, Inc. and The Board of Trade of Kansas City, Missouri, Inc. Clearing and transaction fees are generated through the trading of these products. These trading products, most of which have traded for decades, require authorization from the Commodity Futures Trading Commission (CFTC). Product authorizations from the CFTC have no term limits.