Derivatives and Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	$ 2,715.9	$ 1,691.2
Derivative Asset, Estimated Fair Value	26.9	28.1
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	1,983.1	1,103.9
Derivative Liabilities, Estimated Fair Value		18.2
Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	46.4	87.6
Derivative Asset, Estimated Fair Value	0.0	0.1
Not Designated as Hedging Instrument | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	1,827.1	913.9
Derivative Asset, Estimated Fair Value	0.3	22.2
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	1,827.1	913.9
Derivative Liabilities, Estimated Fair Value	62.3	18.1
Not Designated as Hedging Instrument | Interest rate lock commitments
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	107.6	77.3
Derivative Asset, Estimated Fair Value	0.0	1.8
Not Designated as Hedging Instrument | Forward loan sales contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	81.2	0.0
Derivative Liabilities (included in accounts payable and accrued expenses on the consolidated balance sheets):
Derivative Liabilities, Notional Amount	0.0	102.4
Derivative Liabilities, Estimated Fair Value	0.0	0.0
Designated as Hedging Instrument [Member] | Interest rate swap contracts
Derivative Assets (included in other assets on the consolidated balance sheets):
Derivative Asset, Notional Amount	700.0	700.0
Derivative Asset, Estimated Fair Value	$ 25.3	$ 4.1