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Consolidated Statement of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Comprehensive Income [Abstract]        
Net Income $ 31.3 $ 36.9 $ 82.3 $ 85.9
Other Comprehensive Income (Loss) [Abstract]        
Currency Translation Adjustments 0.0 (0.2) 0.0 (0.2)
Unrealized Gain (Loss) on Securities Net of Income Tax Expense of $–, $0.2, $– and $0.5 0.0 0.4 (0.1) 0.7
Defined Benefit Pension and Other Postretirement Benefit Plans Net of Income Tax Expense of $0.1, $0.2, $0.2 and $0.3 0.3 0.2 0.7 0.4
Total Other Comprehensive Income 0.3 0.4 0.6 0.9
Total Comprehensive Income $ 31.6 $ 37.3 $ 82.9 $ 86.8