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Consolidated Statement of Comprehensive Income Parentheticals - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement of Comprehensive Income [Abstract]        
Unrealized Gain (Loss) on Securities, Income Tax Expense $ 0.0 $ 0.0 $ 0.0 $ 0.1
Defined Benefit Pension and Other Postretirement Benefit Plans, Income Tax Expense $ 0.1 $ 0.1 $ 0.2 $ 0.2