Off-Balance Sheet Arrangements, Guarantees and Other Commitments - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Consolidated venture capital and private equity fund investments
Commitments and Contingencies Disclosure [Line Items]
Commitments Expiration Period	10 years
Consolidated venture capital and private equity fund investments | Lower Limit
Commitments and Contingencies Disclosure [Line Items]
Fund Commitments Investment Cycle	5 years
Consolidated venture capital and private equity fund investments | Upper Limit
Commitments and Contingencies Disclosure [Line Items]
Fund Commitments Investment Cycle	7 years
Standby Letter of Credit
Commitments and Contingencies Disclosure [Line Items]
Deferred revenue	$ 17.2	$ 14.1
Collateral in the form of cash	$ 1,600.0