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Derivatives and Hedging Activities - Schedule of Master Netting Arrangements (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Derivative Asset [Abstract] |  |
Derivative Asset, Fair Value, Gross Asset | $ 37.4 | $ 45.2
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 | 32.7 | 45.1
Derivative Asset, Fair Value, Amount Offset Against Collateral, Total | 4.7 | 0.1
Offsetting Derivative Liabilities [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 127.3 | 159.6
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 | 127.3 | 159.6
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral [Abstract] |  |
Securities Sold under Agreements to Repurchase, Gross | 782.7 | 1,052.9
Securities Sold under Agreements to Repurchase, Asset | 0.0 | 0.0
Securities Sold under Agreements to Repurchase, Total | 782.7 | 1,052.9
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 | 782.7 | 1,052.9
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral, Total | 0.0 | 0.0
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract] |  |
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross | 910.0 | 1,212.5
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 | 910.0 | 1,212.5
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 | 782.7 | 1,052.9
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral, Total | 127.3 | 159.6
Derivative Asset, Notional Amount | 2,144.7 | 2,290.7
Derivative Assets, Estimated Fair Value | 37.4 | 45.2
Derivative Liability, Notional Amount | 2,295.7 | 2,449.0
Derivative Liabilities, Estimated Fair Value | 127.3 | 159.6
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 | 37.3 | 45.1
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 | 32.7 | 45.1
Derivative Asset, Fair Value, Amount Offset Against Collateral, Total | 4.6 | 0.0
Offsetting Derivative Liabilities [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 127.1 | 159.6
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 | 127.1 | 159.6
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract] |  |
Derivative Assets, Estimated Fair Value | 37.3 | 45.1
Derivative Liabilities, Estimated Fair Value | 127.1 | 159.6
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 | 1,589.0 | 1,728.1
Derivative Assets, Estimated Fair Value | 34.3 | 41.6
Derivative Liability, Notional Amount | 1,589.0 | 1,728.1
Derivative Liabilities, Estimated Fair Value | 121.1 | 153.9
Interest Rate Swap [Member] | Designated as Hedging Instrument |  |
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract] |  |
Derivative Asset, Notional Amount | 550.0 | 550.0
Derivative Assets, Estimated Fair Value | 3.0 | 3.5
Derivative Liability, Notional Amount | 300.0 | 300.0
Derivative Liabilities, Estimated Fair Value | 2.4 | 0.3
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
Derivative Liabilities, Estimated Fair Value | 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 | 0.0 | 12.6
Derivative Liability, Notional Amount | 5.6 | 0.0
Derivative Liabilities, Estimated Fair Value | 0.1 | 0.0
Derivative, Fair Value, Net | 0.0 | 0.1
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
Derivative Liabilities, Estimated Fair Value | 3.6 | 5.4
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] |  |
Derivative Liabilities, Estimated Fair Value | 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 | 101.1 | 106.1
Derivative Liabilities, Estimated Fair Value | 0.1 | 0.0
Interest Rate Lock Commitments [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 Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract] |  |
Derivative Assets, Estimated Fair Value | 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 | 5.7 | 0.0
Derivative Assets, Estimated Fair Value | 0.1 | 0.0
Derivative Liability, Notional Amount | 0.0 | 14.8
Derivative Liabilities, Estimated Fair Value | $ 0.0 | $ 0.0

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