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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%