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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2024
USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2024 $ 3.2
Amount of Commitment Expiration by Period - Thereafter 38.6
Total Amounts Committed 41.8
Financial Guarantees [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2024 0.8
Amount of Commitment Expiration by Period - Thereafter 15.5
Total Amounts Committed 16.3
Funding Commitments [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2024 2.4
Total Amounts Committed 2.4
Letters of Credit [Member]  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - Thereafter 23.1
Total Amounts Committed $ 23.1