Commitments, Contingencies and Off-Balance Sheet Arrangements - Off-Balance Sheet Commitments (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2022	$ 1.0
Amount of Commitment Expiration by Period - 2023	1.5
Amount of Commitment Expiration by Period - 2024	2.2
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	17.1
Total Amounts Committed	22.1
Financial Guarantees [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - 2022	1.0
Amount of Commitment Expiration by Period - 2023	1.5
Amount of Commitment Expiration by Period - 2024	2.2
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	5.1
Letters of Credit [Member]
Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Amount of Commitment Expiration by Period - Thereafter	17.0
Total Amounts Committed	$ 17.0