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Income Taxes - Statutory Federal Income Tax Expense, Effective Income Tax Expense, Rates (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Amount |  |  |  |  |  |  |  |  |  |  |
Statutory Federal Income Tax Expense |  |  |  |  |  |  |  |  | $ (138.9) | $ (41.8) | $ (56.4)
Tax-exempt Income and Dividends Received Deduction |  |  |  |  |  |  |  |  | 4.3 | 4.8 | 9.8
Stock-Based Compensation |  |  |  |  |  |  |  |  | 4.4 | 1.4 | 0.4
Nondeductible Executive Compensation |  |  |  |  |  |  |  |  | (2.5) | (1.4) | 0.0
Tax Reform |  |  |  |  |  |  |  |  | 0.0 | 26.4 | 7.4
Other, Net |  |  |  |  |  |  |  |  | 2.2 | (0.1) | (2.4)
Income Tax Expense | $ (32.2) | $ (32.5) | $ (26.4) | $ (39.4) | $ (1.1) | $ 11.8 | $ (8.0) | $ (13.4) | $ (130.5) | $ (10.7) | $ (41.2)
Rate |  |  |  |  |  |  |  |  |  |  |
Statutory Federal Income Tax Expense |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
Tax-exempt Income and Dividends Received Deduction |  |  |  |  |  |  |  |  | (0.70%) | (2.40%) | (6.00%)
Stock-Based Compensation |  |  |  |  |  |  |  |  | (0.70%) | (0.70%) | (0.20%)
Nondeductible Executive Compensation |  |  |  |  |  |  |  |  | 0.40% | 0.70% | 0.00%
Tax Reform |  |  |  |  |  |  |  |  | 0.00% | (13.30%) | (4.60%)
Other, Net |  |  |  |  |  |  |  |  | (0.30%) | 0.10% | 1.40%
Effective Income Tax Benefit (Expense) from Continuing Operations |  |  |  |  |  |  |  |  | 19.70% | 5.40% | 25.60%

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