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Other Comprehensive Income (Loss) And Accumulated Other Comprehensive Income - Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |
Unrealized Holding Gains (Losses) Arising During the Period Before Reclassification Adjustment | $ 433.4 | $ (214.2) | $ 119.1
Reclassification Adjustment for Amounts Included in Net Income | (28.1) | (21.9) | (35.3)
Unrealized Holding Gains (Losses) | 405.3 | (236.1) | 83.8
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | 0.0 | 0.0 | 1.7
Reclassification Adjustment for Amounts Included in Net Income | 0.0 | 0.3 | 0.0
Foreign Currency Translation Adjustments | 0.0 | 0.3 | 1.7
Unrecognized Postretirement Benefit Costs Arising During the Year | (4.8) | (8.0) | 3.9
Amortization of Net Unrecognized Postretirement Benefit Costs | (3.0) | 1.1 | (0.6)
Total Reclassification Adjustments for Amounts Included in Net Income | (3.0) | 1.1 | (0.6)
Net Unrecognized Postretirement Benefit Costs | (7.8) | (6.9) | 3.3
Gains (Losses) on Cash Flow Hedges During the Year Before Reclassification Adjustment | 0.0 | 0.9 | (8.0)
Reclassification Adjustment for Amounts Included in Net Income | 0.4 | 0.3 | 1.3
Gains (Losses) on Cash Flow Hedges | 0.4 | 1.2 | (6.7)
Other Comprehensive Income (Loss) Before Income Taxes | 397.9 | (241.5) | 82.1
Income Tax Benefit (Expense): |  |  |
Unrealized Holding Gains (Losses) Arising During the Year Before Reclassification Adjustment | (91.0) | 45.0 | (38.2)
Reclassification Adjustment for Amounts Included in Net Income | 5.8 | 4.6 | 12.3
Unrealized Holding Gains and Losses | (85.2) | 49.6 | (25.9)
Foreign Currency Translation Adjustments Arising During the Period Before Reclassification Adjustment | 0.0 | 0.0 | (0.6)
Reclassification Adjustment for Amounts Included in Net Income | 0.0 | (0.1) | 0.0
Foreign Currency Translation Adjustment | 0.0 | (0.1) | (0.6)
Unrecognized Postretirement Benefit Costs Arising During the Year | 1.0 | 1.7 | (0.8)
Amortization of Unrecognized Postretirement Benefit Costs | 0.7 | (0.2) | 0.2
Total Reclassification Adjustments for Amounts Included in Net Income | 0.7 | (0.2) | 0.2
Net Unrecognized Postretirement Benefit Costs | 1.7 | 1.5 | (0.6)
Gains (Losses) on Cash Flow Hedges During the Year Before Reclassification Adjustment | 0.0 | (0.2) | 2.8
Reclassification Adjustment for Amounts Included in Net Income | (0.1) | (0.1) | (0.4)
Gains (Losses) on Cash Flow Hedges | (0.1) | (0.3) | 2.4
Other Comprehensive Income Tax Benefit (Expense) | $ (83.6) | $ 50.7 | $ (24.7)

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