Derivatives - Notional and Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Notional amount	$ 313.0	$ 305.7
Fair value	6.8	10.7
Bank of America, N.A.
Derivative [Line Items]
Notional amount	245.5	193.0
Fair value	6.5	6.3
Barclays Bank PLC
Derivative [Line Items]
Notional amount	67.5	98.7
Fair value	0.3	4.1
Citigroup Inc.
Derivative [Line Items]
Notional amount	0.0	0.0
Fair value	0.0	0.0
Credit Suisse International
Derivative [Line Items]
Notional amount	0.0	14.0
Fair value	0.0	0.3
Societe Generale
Derivative [Line Items]
Notional amount	0.0	0.0
Fair value	$ 0.0	$ 0.0