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Derivatives and Hedging Activities - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Aug. 02, 2021 | Jun. 17, 2021 | Dec. 31, 2020
Financial Assets |  |  |  |  |  |  |  |  |
Gross Amounts Recognized | $ 34.1 |  |  |  | $ 34.1 |  |  |  | $ 55.3
Gross Amounts Offset in the Balance Sheet | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Net Amounts in the Balance Sheet | 34.1 |  |  |  | 34.1 |  |  |  | 55.3
Financial Instruments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Fair Value of Financial Collateral in the Balance Sheet | 11.0 |  |  |  | 11.0 |  |  |  | 17.2
Net Amount | 23.1 |  |  |  | 23.1 |  |  |  | 38.1
Derivative Assets (Liabilities), at Fair Value, Net | 34.1 |  |  |  | 34.1 |  |  |  |
Financial Liabilities |  |  |  |  |  |  |  |  |
Gross Amounts Recognized | 21.1 |  |  |  | 21.1 |  |  |  | 17.9
Gross Amounts Offset in the Balance Sheet | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Net Amounts in the Balance Sheet | 21.1 |  |  |  | 21.1 |  |  |  | 17.9
Financial Instruments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Fair Value of Financial Collateral in the Balance Sheet | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Net Amount | 21.1 |  |  |  | 21.1 |  |  |  | 17.9
Repurchase agreements |  |  |  |  |  |  |  |  |
Gross Amounts Recognized | 1,007.5 |  |  |  | 1,007.5 |  |  |  | 1,091.4
Gross Amounts Offset in the Balance Sheet |  |  |  |  |  |  |  |  | 0.0
Net Amounts in the Balance Sheet | 1,007.5 |  |  |  | 1,007.5 |  |  |  | 1,091.4
Financial Instruments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Fair Value of Financial Collateral in the Balance Sheet | 1,007.5 |  |  |  | 1,007.5 |  |  |  | 1,091.4
Net Amount | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Total assets and liabilities |  |  |  |  |  |  |  |  |
Gross Amounts Recognized | 1,028.6 |  |  |  | 1,028.6 |  |  |  | 1,109.3
Gross Amounts Offset in the Balance Sheet |  |  |  |  |  |  |  |  | 0.0
Net Amounts in the Balance Sheet | 1,028.6 |  |  |  | 1,028.6 |  |  |  | 1,109.3
Financial Instruments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Fair Value of Financial Collateral in the Balance Sheet | 1,007.5 |  |  |  | 1,007.5 |  |  |  | 1,091.4
Net Amount | $ 21.1 |  |  |  | 21.1 |  |  |  | 17.9
Payments for (Proceeds from) Derivative Instrument, Investing Activities |  |  |  | $ 500.0 | 200.0 |  |  |  |
Derivatives, Basis and Use of Derivatives | 99 | 87 |  |  |  |  |  |  |
Derivative Liability, Notional Amount | $ 1,442.4 |  |  |  | 1,442.4 |  |  |  | 1,014.1
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |
Total assets and liabilities |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  | $ 200.0 | $ 500.0 |
Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Total assets and liabilities |  |  |  |  |  |  |  |  |
Amount of net gains recognized in mortgage banking revenues | 1.3 |  | $ (0.6) |  | 1.7 | $ 4.4 |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |
Financial Assets |  |  |  |  |  |  |  |  |
Gross Amounts Recognized | 30.1 |  |  |  | 30.1 |  |  |  | 52.0
Gross Amounts Offset in the Balance Sheet | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Net Amounts in the Balance Sheet | 30.1 |  |  |  | 30.1 |  |  |  | 52.0
Financial Instruments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Fair Value of Financial Collateral in the Balance Sheet | 11.0 |  |  |  | 11.0 |  |  |  | 17.2
Net Amount | 19.1 |  |  |  | 19.1 |  |  |  | 34.8
Financial Liabilities |  |  |  |  |  |  |  |  |
Gross Amounts Recognized | 21.1 |  |  |  | 21.1 |  |  |  | 16.8
Gross Amounts Offset in the Balance Sheet | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Net Amounts in the Balance Sheet | 21.1 |  |  |  | 21.1 |  |  |  | 16.8
Financial Instruments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Fair Value of Financial Collateral in the Balance Sheet | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Net Amount | 21.1 |  |  |  | 21.1 |  |  |  | 16.8
Interest Rate Swap [Member] | Not Designated as Hedging Instrument |  |  |  |  |  |  |  |  |
Total assets and liabilities |  |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount | 854.8 |  |  |  | 854.8 |  |  |  | 799.7
Mortgage Related Derivatives |  |  |  |  |  |  |  |  |
Financial Assets |  |  |  |  |  |  |  |  |
Gross Amounts Recognized | 4.0 |  |  |  | 4.0 |  |  |  | 3.3
Gross Amounts Offset in the Balance Sheet | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Net Amounts in the Balance Sheet | 4.0 |  |  |  | 4.0 |  |  |  | 3.3
Financial Instruments | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Fair Value of Financial Collateral in the Balance Sheet | 0.0 |  |  |  | 0.0 |  |  |  | 0.0
Net Amount | 4.0 |  |  |  | 4.0 |  |  |  | 3.3
Financial Liabilities |  |  |  |  |  |  |  |  |
Gross Amounts Recognized |  |  |  |  |  |  |  |  | 1.1
Gross Amounts Offset in the Balance Sheet |  |  |  |  |  |  |  |  | 0.0
Net Amounts in the Balance Sheet |  |  |  |  |  |  |  |  | 1.1
Financial Instruments |  |  |  |  |  |  |  |  | 0.0
Fair Value of Financial Collateral in the Balance Sheet |  |  |  |  |  |  |  |  | 0.0
Net Amount |  |  |  |  |  |  |  |  | $ 1.1
Repurchase Agreements |  |  |  |  |  |  |  |  |
Financial Liabilities |  |  |  |  |  |  |  |  |
Gross Amounts Offset in the Balance Sheet | $ 0.0 |  |  |  | $ 0.0 |  |  |  |

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