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Acquisition of KCG Holdings, Inc. - Intangible assets (Details) - USD ($)	Jul. 20, 2017	Mar. 31, 2018	Dec. 31, 2017
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets		$ 104,387,000	$ 111,224,000
Goodwill		836,583,000	844,883,000
Deferred tax assets		123,289,000	125,760,000
Customer relationships
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets		46,157,000	47,178,000
Favorable leases
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets		5,283,000	5,487,000
KCG
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	$ 174,995,000
Goodwill	128,286,000
Total	303,281,000
Goodwill deductible for tax purposes	0
Deferred tax assets	23,900,000
KCG | Technology
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	67,700,000
KCG | Customer relationships
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	94,000,000
KCG | Trade names
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	$ 1,000,000
Amortization Years	10 years
KCG | Favorable leases
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	$ 5,895,000
KCG | Exchange memberships
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Intangible assets	$ 6,400,000
Minimum | KCG | Technology
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Amortization Years	1 year
Minimum | KCG | Customer relationships
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Amortization Years	13 years
Minimum | KCG | Favorable leases
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Amortization Years	2 years
Maximum | KCG | Technology
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Amortization Years	6 years
Maximum | KCG | Customer relationships
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Amortization Years	17 years
Maximum | KCG | Favorable leases
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Amortization Years	15 years
Market Making
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Goodwill	$ 96,200,000	$ 755,292,000	$ 755,292,000
Technology and Execution Services
Amounts preliminarily allocated to intangible assets, the amortization period and goodwill
Goodwill	$ 32,100,000

X

- Definition

The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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