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Income Taxes - Statutory Federal Income Tax Expense, Effective Income Tax Expense, Rates (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Amount |  |  |
Statutory Federal Income Tax Benefit (Expense) | $ 51.5 | $ (107.1) | $ (138.9)
Tax-exempt Income and Dividends Received Deduction | $ 4.6 | $ 4.0 | $ 4.3
Effective Income Tax Rate Reconciliation, Untaxed Earnings on Company-Owned Life Insurance, Percent | 2.20% | (0.50%) | (0.20%)
Effective Income Tax Reconciliation, Untaxed Earnings on Company-Owned Life Insurance, amount | $ 5.4 | $ 2.7 | $ 1.6
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent | 27.00% | (0.60%) | 0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | $ 66.1 | $ 3.2 | $ 0.0
Stock-Based Compensation | 0.3 | 2.2 | 4.4
Nondeductible Executive Compensation | (2.7) | (2.7) | (2.5)
Other, Net | (0.4) | (2.5) | 0.6
Income Tax Benefit (Expense) | $ 124.8 | $ (100.2) | $ (130.5)
Rate |  |  |
Statutory Federal Income Tax Benefit (Expense) | 21.00% | 21.00% | 21.00%
Tax-exempt Income and Dividends Received Deduction | 1.90% | (0.80%) | (0.70%)
Stock-Based Compensation | 0.10% | (0.50%) | (0.70%)
Nondeductible Executive Compensation | (1.10%) | 0.50% | 0.40%
Other, Net | (0.20%) | 0.50% | (0.10%)
Effective Income Tax Benefit (Expense) | 50.90% | 19.60% | 19.70%

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