Derivatives and Hedging Activities - Schedule of Master Netting Arrangements (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Derivative Asset [Abstract]
Derivative Asset, Fair Value, Gross Asset	$ 44.9	$ 37.4
Derivative Asset, Fair Value, Gross Liability	0.0	0.0
Derivative, Collateral, Obligation to Return Securities	0.0	0.0
Derivative, Collateral, Obligation to Return Cash	42.4	32.7
Derivative Asset, Fair Value, Amount Offset Against Collateral, Total	2.5	4.7
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	133.8	127.3
Derivative Liability, Fair Value, Gross Asset	0.0	0.0
Derivative, Collateral, Right to Reclaim Securities	0.0	0.0
Derivative, Collateral, Right to Reclaim Cash	0.0	0.0
Derivative Liability, Fair Value, Amount Offset Against Collateral, Total	133.8	127.3
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral [Abstract]
Securities Sold under Agreements to Repurchase, Gross	523.9	782.7
Securities Sold under Agreements to Repurchase, Asset	0.0	0.0
Securities Sold under Agreements to Repurchase, Total	523.9	782.7
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	0.0	0.0
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	0.0	0.0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral, Total	523.9	782.7
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross	657.7	910.0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset	0.0	0.0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Total	657.7	910.0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities	0.0	0.0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash	0.0	0.0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral, Total	657.7	910.0
Derivative Asset, Notional Amount	1,420.5	2,144.7
Derivative Assets, Estimated Fair Value	44.9	37.4
Derivative Liability, Notional Amount	2,107.0	2,295.7
Net Liabilities in the Balance Sheet	133.8	127.3
Collateral Pledged
Offsetting Derivative Liabilities [Abstract]
Derivative, Collateral, Right to Reclaim Securities	0.0
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative, Fair Value, Net	0.0
Interest Rate Swap [Member]
Derivative Asset [Abstract]
Derivative Asset, Fair Value, Gross Asset	44.9	37.3
Derivative Asset, Fair Value, Gross Liability	0.0	0.0
Derivative, Collateral, Obligation to Return Securities	0.0	0.0
Derivative, Collateral, Obligation to Return Cash	42.4	32.7
Derivative Asset, Fair Value, Amount Offset Against Collateral, Total	2.5	4.6
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability	133.8
Derivative Liability, Fair Value, Gross Asset	0.0
Derivative, Collateral, Right to Reclaim Securities	0.0
Derivative, Collateral, Right to Reclaim Cash	0.0
Derivative Liability, Fair Value, Amount Offset Against Collateral, Total	133.8
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Assets, Estimated Fair Value	44.9	37.3
Net Liabilities in the Balance Sheet	133.8
Interest Rate Swap [Member] | Not Designated as Hedging Instrument
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Asset, Notional Amount	1,415.4	1,589.0
Derivative Assets, Estimated Fair Value	44.9	34.3
Derivative Liability, Notional Amount	1,415.4	1,589.0
Net Liabilities in the Balance Sheet	130.0	121.1
Interest Rate Swap [Member] | Designated as Hedging Instrument
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Asset, Notional Amount	0.0	550.0
Derivative Assets, Estimated Fair Value	0.0	3.0
Derivative Liability, Notional Amount	300.0	300.0
Net Liabilities in the Balance Sheet	2.8	2.4
Forward Contracts [Member]
Derivative Asset [Abstract]
Derivative Asset, Fair Value, Gross Asset		0.1
Derivative Asset, Fair Value, Gross Liability		0.0
Derivative, Collateral, Obligation to Return Securities		0.0
Derivative, Collateral, Obligation to Return Cash		0.0
Derivative Asset, Fair Value, Amount Offset Against Collateral, Total		0.1
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability		0.1
Derivative Liability, Fair Value, Gross Asset		0.0
Derivative, Collateral, Right to Reclaim Securities		0.0
Derivative, Collateral, Right to Reclaim Cash		0.0
Derivative Liability, Fair Value, Amount Offset Against Collateral, Total		0.1
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Assets, Estimated Fair Value		0.1
Net Liabilities in the Balance Sheet		0.1
Forward Contracts [Member] | Not Designated as Hedging Instrument
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Asset, Notional Amount	2.4	0.0
Derivative Liability, Notional Amount	0.0	5.6
Net Liabilities in the Balance Sheet	0.0	0.1
Derivative, Fair Value, Net	0.0	0.0
Interest Rate Collars | Designated as Hedging Instrument
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Liability, Notional Amount	300.0	300.0
Net Liabilities in the Balance Sheet	1.0	3.6
Risk Participation Agreements
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability		0.1
Derivative Liability, Fair Value, Gross Asset		0.0
Derivative, Collateral, Right to Reclaim Securities		0.0
Derivative, Collateral, Right to Reclaim Cash		0.0
Derivative Liability, Fair Value, Amount Offset Against Collateral, Total		0.1
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Net Liabilities in the Balance Sheet		0.1
Risk Participation Agreements | Not Designated as Hedging Instrument
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Liability, Notional Amount	91.6	101.1
Net Liabilities in the Balance Sheet	0.0	0.1
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Derivative Asset, Notional Amount	2.7	5.7
Derivative Assets, Estimated Fair Value	$ 0.0	0.1
Interest Rate Swap and Interest Rate Collar
Offsetting Derivative Liabilities [Abstract]
Derivative Liability, Fair Value, Gross Liability		127.1
Derivative Liability, Fair Value, Gross Asset		0.0
Derivative, Collateral, Right to Reclaim Securities		0.0
Derivative, Collateral, Right to Reclaim Cash		0.0
Derivative Liability, Fair Value, Amount Offset Against Collateral, Total		127.1
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract]
Net Liabilities in the Balance Sheet		$ 127.1