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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Impairment Losses     $ (20.0) $ (12.1)
Income Tax Benefit (Expense) $ (29.8) $ (32.5) (77.1) (98.3)
Net Income 122.3 129.0 312.4 406.4
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Net Income 6.3 (0.3) 11.0 21.7
Having No Credit Losses Recognized in Consolidated Statements of Income | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Net Realized Gains on Sales of Investments 10.0 1.7 36.4 39.1
Impairment Losses (1.0) (1.9) (20.0) (12.2)
Total Before Income Taxes 9.0 (0.2) 16.4 26.9
Income Tax Benefit (Expense) (1.9) 0.0 (3.4) (5.7)
Net Income 7.1 (0.2) 13.0 21.2
Net Unrecognized Postretirement Benefit Costs | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Interest and Other Expenses (0.9) 0.0 (2.3) 0.6
Income Tax Benefit (Expense) (0.2) 0.0 0.5 (0.1)
Net Income (0.7) 0.0 (1.8) 0.5
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]        
Interest and Other Expenses (0.2) (0.1) (0.3) 0.0
Income Tax Benefit (Expense) 0.1 0.0 0.1 0.0
Net Income $ (0.1) $ (0.1) $ (0.2) $ 0.0