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Investment Securities - Equity Investments (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Jul. 31, 2021	Jun. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Fair Value			$ 10.5	$ 9.5
Total realized and unrealized gains on sale of equity investments				$ 22.8	$ 26.2
Social Finance Inc (SoFi)
Investment Holdings [Line Items]
Total realized and unrealized gains on sale of equity investments			$ 4.4
Realized (loss) gain	$ (0.7)
Visa Class B shares
Investment Holdings [Line Items]
Realized (loss) gain		$ 22.1