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Other Comprehensive Income/Loss - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity | $ 3,005.5 | $ 1,984.8 | $ 3,005.5 | $ 1,984.8 | $ 1,986.6 | $ 3,271.9 | $ 1,970.9 | $ 1,959.8
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax |  |  |  |  | 15.0 |  |  |
Net unrealized gain (loss) on derivatives | (12.3) | 2.4 | (7.1) | 1.7 |  |  |  |
Other than Temporary Impairment Losses, Investments, Reclassification Adjustment of Noncredit Portion from Held-to-maturity to Available-for-sale Securities, before Tax |  |  | 0.2 | 0.0 |  |  |  |
Change in net unrealized gain during period, pre-tax | (236.4) | (13.4) | (650.6) | (81.0) |  |  |  |
Change in net unrealized gain during period, tax expense (benefit) | (53.4) | (3.3) | (161.3) | (20.5) |  |  |  |
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax | (183.0) | (10.1) | (489.3) | (60.5) |  |  |  |
Reclassification adjustment for net loss (gain) included in income | 24.2 | (0.3) | 24.4 | (0.2) |  |  |  |
Reclassification adjustment for net gains included in income, tax expense (benefit) | 5.5 | (0.1) | 5.5 | (0.1) |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 18.7 | (0.2) | 18.9 | (0.1) |  |  |  |
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, Sale, Tax |  |  | 0.1 | 0.0 |  |  |  |
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, Sale, after Tax |  |  | 0.1 | 0.0 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), before Tax | (1.7) | (2.5) | (25.6) | 22.3 |  |  |  |
Amortization of unrealized gains on available-for-sale securities transferred into held-to-maturity, tax expense (benefit) | (0.4) | (0.6) | (6.3) | 5.7 |  |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer to Held-to-Maturity, Adjustment from AOCI for Amortization of Gain (Loss), after Tax | (1.3) | (1.9) | (19.3) | 16.6 |  |  |  |
Unrealized loss on derivatives, pre-tax | (15.9) | 3.2 | (9.6) | 2.3 |  |  |  |
Unrealized loss on derivatives, tax expense (benefit) | (3.6) | 0.8 | (2.5) | 0.6 |  |  |  |
Other comprehensive loss, before tax | (229.8) | (13.0) | (661.2) | (56.6) |  |  |  |
Other Comprehensive Income (Loss), tax expense (benefit) | (51.9) | (3.2) | (164.5) | (14.3) |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (177.9) | (9.8) | (496.7) | (42.3) |  |  |  |
Net unrealized loss on investment securities available-for-sale |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity | (499.1) |  | (499.1) |  | (29.0) |  |  |
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, after Tax |  |  | (4.4) |  |  |  |  |
Net unrealized gain on derivatives |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Net unrealized gain (loss) on derivatives |  |  | (4.2) |  | 3.0 |  |  |
Net accumulated other comprehensive loss |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total stockholders’ equity | $ (507.7) | $ 14.3 | $ (507.7) | $ 14.3 | $ (11.0) | $ (329.8) | $ 24.1 | $ 56.6

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