Deposits - Scheduled Maturity of Total Time Deposits (Details) $ in Millions	Dec. 31, 2024 USD ($)
Time Deposits [Line Items]
1 Year or Less	$ 7,012.0
Over 1 Year to 2 Years	83.8
Over 2 Years to 3 Years	5.3
Over 3 Years to 4 Years	10.2
Over 4 Years to 5 Years	2.1
Over 5 Years	0.0
Total	7,113.4
U.S. OFFICE
Time Deposits [Line Items]
1 Year or Less	4,845.1
Over 1 Year to 2 Years	83.8
Over 2 Years to 3 Years	5.3
Over 3 Years to 4 Years	10.2
Over 4 Years to 5 Years	2.1
Over 5 Years	0.0
Total	4,946.5
NON-U.S. OFFICES
Time Deposits [Line Items]
1 Year or Less	2,166.9
Over 1 Year to 2 Years	0.0
Over 2 Years to 3 Years	0.0
Over 3 Years to 4 Years	0.0
Over 4 Years to 5 Years	0.0
Over 5 Years	0.0
Total	$ 2,166.9