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Other Comprehensive Income/Loss - Schedule of Accumulated Other Comprehensive Income (Loss) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  | $ 0.2 | $ 0.0 |
Net accumulated other comprehensive gains | $ 1,977.6 | 1,977.6 | 1,982.6 | $ 2,013.9
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax | (0.2) | (0.2) |  | 0.0
Reclassification adjustment for net gains included in income | (0.1) | (0.1) | (0.1) |
Other than Temporary Impairment Losses, Investments, Reclassification Adjustment of Noncredit Portion from Held-to-maturity to Available-for-sale Securities, before Tax |  | 0.0 | (6.0) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0.0 | 0.0 | 0.0 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (0.1) | (0.1) | (0.1) |
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, Sale, after Tax |  | 0.0 | (4.4) |
Other Comprehensive Loss, Held-to-maturity Security, Reclassification Adjustment from AOCI for Noncredit Portion of OTTI, Sale, Tax |  | 0.0 | (1.6) |
Net unrealized gains on investment securities available-for-sale |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net accumulated other comprehensive gains | 62.1 | 62.1 |  | 10.6
Net accumulated other comprehensive gains |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Net accumulated other comprehensive gains | 61.9 | 61.9 | $ 13.4 | 11.0
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 | $ 0.0 | $ 0.0 |  | $ 0.4

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