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ITG Acquisition - Background (Details)	Mar. 01, 2019 USD ($)
Committed facility
Business Acquisition [Line Items]
Maximum borrowing capacity	$ 50,000,000.0
Letter of credit
Business Acquisition [Line Items]
Maximum borrowing capacity	5,000,000.0
Swingline subfacility
Business Acquisition [Line Items]
Maximum borrowing capacity	5,000,000.0
First lien term loan
Business Acquisition [Line Items]
Face amount	1,500,000,000.0
Proceeds from borrowings	404,500,000
First lien term loan | ITG
Business Acquisition [Line Items]
Proceeds from borrowings	$ 1,095,000,000.0

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Face (par) amount of debt instrument at time of issuance.

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-SubTopic 30
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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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