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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
Mar. 31, 2019
Mar. 31, 2018
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Net Realized Gains on Sales of Investments $ 16.1 $ 2.6
Net Impairment Losses Recognized in Earnings (3.6) (0.5)
Interest and Other Expenses (41.4) (29.0)
Total Before Income Taxes 194.7 67.0
Income Tax Expense (39.4) (13.4)
Net Income 155.3 53.8
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Net Income 10.4 1.3
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Net Realized Gains on Sales of Investments 16.1 2.4
Net Impairment Losses Recognized in Earnings (3.6) (0.5)
Total Before Income Taxes 12.5 1.9
Income Tax Expense (2.6) (0.4)
Net Income 9.9 1.5
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Interest and Other Expenses 0.6 (0.3)
Income Tax Expense (0.2) 0.1
Net Income 0.4 (0.2)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]    
Interest and Other Expenses 0.1 (0.1)
Income Tax Expense 0.0 0.1
Net Income $ 0.1 $ 0.0