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Other Comprehensive Income/Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net accumulated other comprehensive gains | $ 1,956.1 | $ 2,013.9 | $ 1,736.9 | $ 1,693.9
Net unrealized gains on investment securities available-for-sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net accumulated other comprehensive gains | 39.6 | 10.6 |  |
Net accumulated other comprehensive gains |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net accumulated other comprehensive gains | 39.8 | 11.0 | $ (4.4) | $ (24.6)
Postretirement Health Coverage | Net actuarial gains on defined benefit post-retirement benefit plans |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net actuarial gains on defined benefit post-retirement benefit plans | $ 0.2 | $ 0.4 |  |

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