Litigation and Regulatory Matters - Additional Information (Details)	1 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) financial_institution	Dec. 31, 2012	Jun. 30, 2020 USD ($)
Loss Contingencies [Line Items]
Estimate of reasonably possible loss	$ 175,000,000		$ 175,000,000
South African Foreign Exchange Market [Member]
Loss Contingencies [Line Items]
Number of financial institutions included in complaint | financial_institution	28
Shareholder Derivative Action [Member]
Loss Contingencies [Line Items]
Period of deferred prosecution agreement		5 years
Payment to be received from the D&O carriers			$ 72,500,000