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Derivatives and Hedging Activities - Schedule of Master Netting Arrangements (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Derivative Asset [Abstract] |  |
Derivative Asset, Fair Value, Gross Asset | $ 45.2 | $ 28.1
Derivative Asset, Fair Value, Gross Liability | 0.0 | 0.0
Derivative Asset, Total | 45.2 | 28.1
Derivative, Collateral, Obligation to Return Securities | 0.0 | 0.0
Derivative, Collateral, Obligation to Return Cash | 45.1 | 8.0
Derivative Asset, Fair Value, Amount Offset Against Collateral, Total | 0.1 | 20.1
Offsetting Derivative Liabilities [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 159.6 | 18.2
Derivative Liability, Fair Value, Gross Asset | 0.0 | 0.0
Derivative Liability, Total | 159.6 | 18.2
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 | 159.6 | 18.2
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral [Abstract] |  |
Securities Sold under Agreements to Repurchase, Gross | 1,052.9 | 1,051.1
Securities Sold under Agreements to Repurchase, Asset | 0.0 | 0.0
Securities Sold under Agreements to Repurchase, Total | 1,052.9 | 1,051.1
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 | 1,052.9 | 1,051.1
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 | 1,212.5 | 1,069.3
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 | 1,212.5 | 1,069.3
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 | 1,052.9 | 1,051.1
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral, Total | 159.6 | 18.2
Derivative Asset, Notional Amount | 2,290.7 | 1,691.2
Derivative Assets, Estimated Fair Value | 45.2 | 28.1
Derivative Liability, Notional Amount | 2,449.0 | 1,103.9
Derivative Liabilities, Estimated Fair Value | 159.6 | 18.2
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 | 45.1 | 26.3
Derivative Asset, Fair Value, Gross Liability | 0.0 | 0.0
Derivative Asset, Total | 45.1 | 26.3
Derivative, Collateral, Obligation to Return Securities | 0.0 | 0.0
Derivative, Collateral, Obligation to Return Cash | 45.1 | 8.0
Derivative Asset, Fair Value, Amount Offset Against Collateral, Total | 0.0 | 18.3
Offsetting Derivative Liabilities [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 159.6 | 18.2
Derivative Liability, Fair Value, Gross Asset | 0.0 | 0.0
Derivative Liability, Total | 159.6 | 18.2
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 | 159.6 | 18.2
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 | 1,728.1 | 913.9
Derivative Assets, Estimated Fair Value | 41.6 | 22.2
Derivative Liability, Notional Amount | 1,728.1 | 913.9
Derivative Liabilities, Estimated Fair Value | 153.9 | 18.1
Interest Rate Swap [Member] | Designated as Hedging Instrument |  |
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract] |  |
Derivative Asset, Notional Amount | 550.0 | 700.0
Derivative Assets, Estimated Fair Value | 3.5 | 4.1
Derivative Liability, Notional Amount | 300.0 | 87.6
Derivative Liabilities, Estimated Fair Value | 0.3 | 0.1
Mortgage related derivatives |  |
Derivative Asset [Abstract] |  |
Derivative Asset, Fair Value, Gross Asset | 0.1 | 1.8
Derivative Asset, Fair Value, Gross Liability | 0.0 | 0.0
Derivative Asset, Total | 0.1 | 1.8
Derivative, Collateral, Obligation to Return Securities | 0.0 | 0.0
Derivative, Collateral, Obligation to Return Cash | 0.0 | 0.0
Derivative Asset, Fair Value, Amount Offset Against Collateral, Total | 0.1 | 1.8
Offsetting Derivative Liabilities [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 0.0 |
Derivative Liability, Fair Value, Gross Asset | 0.0 |
Derivative Liability, Total | 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 | 0.0 |
Forward Contracts [Member] | Not Designated as Hedging Instrument |  |
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract] |  |
Derivative Asset, Notional Amount | 12.6 | 0.0
Derivative Liability, Notional Amount | 0.0 | 102.4
Derivative Liabilities, Estimated Fair Value | 0.0 | 0.0
Derivative, Fair Value, Net | 0.1 | 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 | 0.0
Derivative Liabilities, Estimated Fair Value | 5.4 | 0.0
Risk Participation Agreements |  |
Offsetting Derivative Liabilities [Abstract] |  |
Derivative Liability, Fair Value, Gross Liability | 0.0 |
Derivative Liability, Fair Value, Gross Asset | 0.0 |
Derivative Liability, Total | 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 | 0.0 |
Risk Participation Agreements | Not Designated as Hedging Instrument |  |
Offsetting Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned [Abstract] |  |
Derivative Liability, Notional Amount | 106.1 | 0.0
Derivative Liabilities, Estimated Fair Value | 0.0 | 0.0
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 | 0.0 | 77.3
Derivative Assets, Estimated Fair Value | 0.0 | 1.8
Derivative Liability, Notional Amount | 14.8 | 0.0
Derivative Liabilities, Estimated Fair Value | $ 0.0 | $ 0.0

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