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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Statement of Comprehensive Income [Abstract] |  |  |  |
Net Income | $ 129.0 | $ 92.2 | $ 406.4 | $ 183.6
Other Comprehensive Income (Loss) Before Income Taxes: |  |  |  |
Unrealized Holding Gains (Losses) | 118.3 | (49.9) | 440.4 | (232.1)
Foreign Currency Translation Adjustments | 0.0 | 0.0 | 0.0 | 0.3
Decrease (Increase) in Net Unrecognized Postretirement Benefit Costs | (0.4) | 0.2 | 0.2 | 0.8
Gain on Cash Flow Hedges | 0.2 | 0.9 | 0.3 | 1.1
Other Comprehensive Income (Loss) Before Income Taxes | 118.1 | (48.8) | 440.9 | (229.9)
Other Comprehensive Income Tax Benefit (Expense) | (24.9) | 10.2 | (92.6) | 48.3
Other Comprehensive Income (Loss) | 93.2 | (38.6) | 348.3 | (181.6)
Total Comprehensive Income | $ 222.2 | $ 53.6 | $ 754.7 | $ 2.0

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