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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Net Unrealized Gains on Investments, Net of Income Taxes:    
No Credit Losses Recognized in Condensed Consolidated Statements of Income $ 602.3 $ 439.4
Credit Losses Recognized in Condensed Consolidated Statements of Income (2.9) 0.0
Net Unrecognized Postretirement Benefit Costs, Net of Income Taxes (99.5) (100.6)
Loss on Cash Flow Hedges, Net of Income Taxes (2.6) (2.7)
Accumulated Other Comprehensive Income $ 497.3 $ 336.1