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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Comprehensive Income [Abstract]    
Net Income $ 51.0 $ 49.0
Other Comprehensive Income (Loss) [Abstract]    
Unrealized Gain (Loss) on Securities Net of Income Tax Expense of $– and $0.3 (0.1) 0.3
Defined Benefit Pension and Other Postretirement Benefit Plans Net of Income Tax Expense of $0.1 and $0.1 0.4 0.2
Total Other Comprehensive Income 0.3 0.5
Total Comprehensive Income $ 51.3 $ 49.5