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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net Income $ 123.2 $ 64.0
Other Comprehensive Income (Loss) Before Income Taxes:    
Decrease (Increase) in Net Unrecognized Postretirement Benefit Costs 0.3 0.7
Gain on Cash Flow Hedges 0.1 0.1
Other Comprehensive Income (Loss) Before Income Taxes (365.7) (204.0)
Other Comprehensive Income Tax Benefit (Expense) 75.7 42.8
Other Comprehensive Income (Loss), Net of Taxes (290.0) (161.2)
Total Comprehensive Income (Loss) (166.8) (97.2)
No Credit Losses Recognized in Condensed Consolidated Statements of Income    
Other Comprehensive Income (Loss) Before Income Taxes:    
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities with: (364.0) (201.9)
Credit Losses Recognized in Condensed Consolidated Statements of Income    
Other Comprehensive Income (Loss) Before Income Taxes:    
Changes in Net Unrealized Holding Gains (Losses) on Investment Securities with: $ (2.1) $ (2.9)