Investment Securities - Investments In Private Equity Funds Subject to Lock-Up Periods (Details) - Private equity funds $ in Millions	Jun. 30, 2022 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Fair Value	$ 191.7
1 – 3 years
Debt and Equity Securities, FV-NI [Line Items]
Fair Value	29.8
3 – 5 years
Debt and Equity Securities, FV-NI [Line Items]
Fair Value	21.0
5 – 10 years
Debt and Equity Securities, FV-NI [Line Items]
Fair Value	128.8
Greater than 10 years
Debt and Equity Securities, FV-NI [Line Items]
Fair Value	$ 12.1