Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2022	$ 0.5
Amount of Commitment Expiration by Period - 2023	1.4
Amount of Commitment Expiration by Period - 2024	2.0
Amount of Commitment Expiration by Period - 2025	0.2
Amount of Commitment Expiration by Period - 2026	0.1
Amount of Commitment Expiration by Period - Thereafter	13.4
Total Amounts Committed	17.6
Financial Guarantees [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2022	0.5
Amount of Commitment Expiration by Period - 2023	1.4
Amount of Commitment Expiration by Period - 2024	2.0
Amount of Commitment Expiration by Period - 2025	0.2
Amount of Commitment Expiration by Period - 2026	0.1
Amount of Commitment Expiration by Period - Thereafter	0.1
Total Amounts Committed	4.3
Letters of Credit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - Thereafter	13.3
Total Amounts Committed	$ 13.3