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Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail)
$ in Millions
 3 Months Ended
Sep. 30, 2025
USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2025 $ 0.0
Amount of Commitment Expiration by Period - 2026 0.0
Amount of Commitment Expiration by Period - 2027 0.0
Amount of Commitment Expiration by Period - 2028 0.0
Amount of Commitment Expiration by Period - 2029 0.0
Amount of Commitment Expiration by Period - Thereafter 56.3
Total Amounts Committed 56.3
Financial guarantees  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2025 0.0
Amount of Commitment Expiration by Period - 2026 0.0
Amount of Commitment Expiration by Period - 2027 0.0
Amount of Commitment Expiration by Period - 2028 0.0
Amount of Commitment Expiration by Period - 2029 0.0
Amount of Commitment Expiration by Period - Thereafter 42.0
Total Amounts Committed 42.0
Letters of credit  
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]  
Amount of Commitment Expiration by Period - 2025 0.0
Amount of Commitment Expiration by Period - 2026 0.0
Amount of Commitment Expiration by Period - 2027 0.0
Amount of Commitment Expiration by Period - 2028 0.0
Amount of Commitment Expiration by Period - 2029 0.0
Amount of Commitment Expiration by Period - Thereafter 14.3
Total Amounts Committed $ 14.3