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Accumulated Other Comprehensive Income (Loss) - Schedule of Pretax and After-tax Components of Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI activity before reclassification, net amount |  |  | $ (481.0) | $ (25.0)
Amounts reclassified from AOCI |  |  | 6.0 | (9.0)
Gross Unrealized | $ (212.0) | $ 15.0 | (627.0) | (44.0)
Income Taxes | 52.0 | (3.0) | 152.0 | 10.0
Other comprehensive (loss) income, net of tax | (160.0) | 12.0 | (475.0) | (34.0)
Defined benefit pension items |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI activity before reclassification, gross amount | 0.0 | 0.0 | 0.0 | 0.0
AOCI activity before reclassification, tax | 0.0 | 0.0 | 0.0 | 0.0
AOCI activity before reclassification, net amount | 0.0 | 0.0 | 0.0 | 0.0
Amounts reclassified from AOCI |  |  | 5.0 | 10.0
Gross Unrealized | 4.0 | 6.0 | 7.0 | 13.0
Income Taxes | (1.0) | (1.0) | (2.0) | (3.0)
Other comprehensive (loss) income, net of tax | 3.0 | 5.0 | 5.0 | 10.0
Defined benefit pension items | Other noninterest expense |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification out of AOCI, gross amount | 4.0 | 6.0 | 7.0 | 13.0
Reclassification out of AOCI, tax | (1.0) | (1.0) | (2.0) | (3.0)
Amounts reclassified from AOCI | 3.0 | 5.0 | 5.0 | 10.0
Unrealized loss on securities available for sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI activity before reclassification, gross amount | (216.0) | 25.0 |  |
AOCI activity before reclassification, tax | 53.0 | (6.0) |  |
AOCI activity before reclassification, net amount | (163.0) | 19.0 |  |
Gross Unrealized | (216.0) | 9.0 |  |
Income Taxes | 53.0 | (2.0) |  |
Other comprehensive (loss) income, net of tax | (163.0) | 7.0 |  |
Unrealized loss on securities available for sale | Realized gain on sales of investment securities available for sale, net |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification out of AOCI, gross amount | 0.0 | (16.0) |  |
Reclassification out of AOCI, tax | 0.0 | 4.0 |  |
Amounts reclassified from AOCI | $ 0.0 | $ (12.0) |  |
Unrealized loss on securities available for sale transferred to securities held to maturity |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI activity before reclassification, gross amount |  |  | 0.0 | 0.0
AOCI activity before reclassification, tax |  |  | 0.0 | 0.0
AOCI activity before reclassification, net amount |  |  | 0.0 | 0.0
Amounts reclassified from AOCI |  |  | 1.0 | 0.0
Gross Unrealized |  |  | 1.0 | 0.0
Income Taxes |  |  | 0.0 | 0.0
Other comprehensive (loss) income, net of tax |  |  | 1.0 | 0.0
Unrealized loss on securities available for sale transferred to securities held to maturity | Interest on investment securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification out of AOCI, gross amount |  |  | 1.0 | 0.0
Reclassification out of AOCI, tax |  |  | 0.0 | 0.0
Amounts reclassified from AOCI |  |  | 1.0 | 0.0
Unrealized (loss) gain on securities available for sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
AOCI activity before reclassification, gross amount |  |  | (635.0) | (32.0)
AOCI activity before reclassification, tax |  |  | 154.0 | 7.0
AOCI activity before reclassification, net amount |  |  | (481.0) | (25.0)
Amounts reclassified from AOCI |  |  | 0.0 | (19.0)
Gross Unrealized |  |  | (635.0) | (57.0)
Income Taxes |  |  | 154.0 | 13.0
Other comprehensive (loss) income, net of tax |  |  | (481.0) | (44.0)
Unrealized (loss) gain on securities available for sale | Realized gain on sales of investment securities available for sale, net |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification out of AOCI, gross amount |  |  | 0.0 | (25.0)
Reclassification out of AOCI, tax |  |  | 0.0 | 6.0
Amounts reclassified from AOCI |  |  | $ 0.0 | $ (19.0)

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