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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, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Amount |  |  |  |  |  |  |  |  |  |  |
Statutory Federal Income Tax Expense |  |  |  |  |  |  |  |  | $ (107.1) | $ (138.9) | $ (41.8)
Tax-exempt Income and Dividends Received Deduction |  |  |  |  |  |  |  |  | $ 4.0 | $ 4.3 | $ 4.8
Effective Income Tax Rate Reconciliation, Untaxed Earnings on Company-Owned Life Insurance, Percent |  |  |  |  |  |  |  |  | (0.50%) | (0.20%) | (0.40%)
Effective Income Tax Rate Reconciliation, Untaxed Earnings on Company-Owned Life Insurance |  |  |  |  |  |  |  |  | $ 2.7 | $ 1.6 | $ 0.8
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent |  |  |  |  |  |  |  |  | (0.60%) | 0.00% | 0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount |  |  |  |  |  |  |  |  | $ 3.2 | $ 0.0 | $ 0.0
Stock-Based Compensation |  |  |  |  |  |  |  |  | 2.2 | 4.4 | 1.4
Nondeductible Executive Compensation |  |  |  |  |  |  |  |  | (2.7) | (2.5) | (1.4)
Tax Reform |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 26.4
Other, Net |  |  |  |  |  |  |  |  | (2.5) | 0.6 | (0.9)
Income Tax Benefit (Expense) | $ (23.1) | $ (29.8) | $ (33.6) | $ (13.7) | $ (32.2) | $ (32.5) | $ (26.4) | $ (39.4) | $ (100.2) | $ (130.5) | $ (10.7)
Rate |  |  |  |  |  |  |  |  |  |  |
Statutory Federal Income Tax Expense |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Tax-exempt Income and Dividends Received Deduction |  |  |  |  |  |  |  |  | (0.80%) | (0.70%) | (2.40%)
Stock-Based Compensation |  |  |  |  |  |  |  |  | (0.50%) | (0.70%) | (0.70%)
Nondeductible Executive Compensation |  |  |  |  |  |  |  |  | 0.50% | 0.40% | 0.70%
Tax Reform |  |  |  |  |  |  |  |  | 0.00% | 0.00% | (13.30%)
Other, Net |  |  |  |  |  |  |  |  | 0.50% | (0.10%) | 0.50%
Effective Income Tax Benefit (Expense) from Continuing Operations |  |  |  |  |  |  |  |  | 19.60% | 19.70% | 5.40%

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