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Acquisition of KCG Holdings, Inc. (Details) - USD ($) $ / shares in Units, $ in Millions	Aug. 10, 2017	Jul. 21, 2017	Jul. 20, 2017	Mar. 31, 2018	Dec. 31, 2017
Temasek Investment
Business Acquisition [Line Items]
Other offering costs	$ 7.8
Senior Secured Notes Due 2020
Business Acquisition [Line Items]
Interest rate (as a percent)		6.875%
Redemption price as a percentage of the principal amount		103.438%
Face amount		$ 465.0
Class A
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)				$ 0.00001	$ 0.00001
Class A | NIH Investment Agreement
Business Acquisition [Line Items]
Number of shares of stock issued	338,124
Aggregate purchase price	$ 5.2
KCG
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)			$ 0.01
Right to receive cash (in dollars per share)			$ 20.00
Cash purchase price			$ 1,400.0
Fair value ( in dollars per share)			$ 20.00
KCG | NIH Investment Agreement
Business Acquisition [Line Items]
Number of shares of stock issued			39,725,979
Aggregate purchase price			$ 613.5
KCG | Class A | Aranda
Business Acquisition [Line Items]
Number of shares of stock issued			6,346,155
Aggregate purchase price			$ 99.0
KCG | Class A | Temasek Investment
Business Acquisition [Line Items]
Number of shares of stock issued	1,666,666
Aggregate purchase price	$ 26.0
KCG | Class A | NIH Investment Agreement
Business Acquisition [Line Items]
Number of shares of stock issued	338,124
Aggregate purchase price	$ 5.2

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