Derivatives and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	$ 1,773.8	$ 2,144.7
Derivative Asset, Estimated Fair Value	28.6	37.4
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	1,868.9	2,295.7
Derivative Liabilities, Estimated Fair Value	94.2	127.3
Not Designated as Hedging Instrument | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	1,468.5	1,589.0
Derivative Asset, Estimated Fair Value	28.3	34.3
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	1,468.5	1,589.0
Derivative Liabilities, Estimated Fair Value	93.0	121.1
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	5.3	5.7
Derivative Asset, Estimated Fair Value	0.0	0.1
Not Designated as Hedging Instrument | Forward loan sales contracts
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	4.9	5.6
Derivative Liabilities, Estimated Fair Value	0.0	0.1
Designated as Hedging Instrument [Member] | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	300.0	550.0
Derivative Asset, Estimated Fair Value	0.3	3.0
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	0.0	300.0
Derivative Liabilities, Estimated Fair Value	$ 0.0	$ 2.4