Derivatives - Notional and Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Notional amount	$ 359.4	$ 313.0
Fair value	19.0	6.8
Bank of America, N.A.
Derivative [Line Items]
Notional amount	270.2	245.5
Fair value	15.5	6.5
Credit Suisse International
Derivative [Line Items]
Notional amount	0.0	0.0
Fair value	0.0	0.0
Societe Generale
Derivative [Line Items]
Notional amount	0.0	0.0
Fair value	0.0	0.0
Barclays Bank PLC
Derivative [Line Items]
Notional amount	89.2	67.5
Fair value	3.5	0.3
Citigroup
Derivative [Line Items]
Notional amount	0.0	0.0
Fair value	$ 0.0	$ 0.0