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Consolidated Statement of Shareholders' Equity - USD ($)
$ in Millions
Total
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Common Stock [Member]
Consolidated Statement of Shareholders' Equity [Roll Forward]        
Adjustments to Opening Balances - Net of Income Taxes [1] $ 0.5 $ 6.1 $ (5.6) $ 0.0
Beginning Balance - Adjusted 2,068.7 695.5 (28.2) 1,401.4
Beginning Balance at Dec. 31, 2017 2,068.2 689.4 (22.6) 1,401.4
Comprehensive Income [Abstract]        
Net Income 82.3 82.3    
Other Comprehensive Income – Net of Tax [Abstract]        
Unrealized Loss on Debt Securities (0.1)   (0.1)  
Defined Benefit Pension and Other Postretirement Plans 0.7   0.7  
Total Comprehensive Income 82.9      
Common Stock Issued 14.0     14.0
Dividends Declared (57.4) (57.4)    
Ending Balance at Jun. 30, 2018 $ 2,108.2 $ 720.4 $ (27.6) $ 1,415.4
[1] Reflects the impacts associated with the adoption of accounting standards concerning Financial Instruments, Revenue from Contracts with Customers and the Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. (See Note 1. Operations and Significant Accounting Policies.)