Concentrations of Credit Risk - Commercial Real Estate Loans (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Commercial Mortgages
TOTAL LOANS AND LEASES	$ 42,893.3	$ 40,480.6
Mortgages
Commercial Mortgages
Office	1,054.0	1,011.4
Apartment/ Multi-family	1,392.7	1,288.8
Retail	572.2	601.8
Industrial/ Warehouse	596.2	442.9
Other	548.0	516.8
TOTAL LOANS AND LEASES	4,163.1	3,861.7
Commercial Real Estate
Commercial Mortgages
TOTAL LOANS AND LEASES	4,773.0	4,326.3
Construction, Acquisition and Development Loans	$ 609.9	$ 464.6