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Consolidated Statement of Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Comprehensive Income (Loss) [Abstract]        
Net Income $ 14.0 $ 14.4 $ 46.5 $ 38.8
Other Comprehensive Income (Loss) [Abstract]        
Unrealized Gain (Loss) on Securities, Net of Income Taxes of $0.1, $(0.5), $0.1 and $0.2 0.1 (0.5) 0.1 0.5
Unrealized Gain (Loss) on Derivatives, Net of Income Taxes of $0.1, $-, $0.1 and $(0.1) 0 (0.1) 0.1 (0.2)
Defined Benefit Pension and Other Postretirement Benefit Plans, Net of Income Taxes of $0.3, $0.4, $0.5 and $0.7 0.5 0.5 0.8 1.0
Total Other Comprehensive Income (Loss) 0.6 [1] (0.1) 1.0 [1] 1.3
Comprehensive Income $ 14.6 $ 14.3 $ 47.5 $ 40.1
[1] Amounts shown are net of tax.