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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Premium on Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Common Stock, Shares, Outstanding   199.7      
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares   0.0      
Balance at Dec. 31, 2016 $ 3,443.8 $ 2.0 $ 1,103.8 $ 2,367.3 $ (29.3)
Changes in Stockholders' Equity          
Other Comprehensive Income (Loss), Net of Tax, Number of Shares   0.0      
Net income 36.0 $ 0.0 0.0   0.0
Net Income (Loss) Attributable to Parent 36.0        
Dividends, Common Stock, Cash, Number of Shares   0.0      
Other comprehensive income, net of tax 0.6 $ 0.0 0.0 0.0 0.6
Dividends declared on common stock (60.4) $ 0.0 0.0 (60.4) 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares   0.0      
Stock-based compensation 2.1 $ 0.0 2.1 0.0 0.0
Balance at Mar. 31, 2017 3,444.4 2.0 1,105.9 2,365.2 (28.7)
Changes in Stockholders' Equity          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification 22.3 $ 0.0 0.0 22.3 0.0
Common Stock, Shares, Outstanding   199.7      
Common Stock, Shares, Outstanding   199.7      
Balance at Dec. 31, 2017 3,851.1 $ 2.0 1,112.8 2,759.5 (23.2)
Changes in Stockholders' Equity          
Other Comprehensive Income (Loss), Net of Tax, Number of Shares   0.0      
Net income 55.0 $ 0.0 0.0   0.0
Net Income (Loss) Attributable to Parent 55.0     55.0  
Dividends, Common Stock, Cash, Number of Shares   0.0      
Other comprehensive income, net of tax 0.2 $ 0.0 0.0 0.0 0.2
Dividends declared on common stock (66.5) $ 0.0 0.0 (66.5) 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares   0.0      
Stock-based compensation 2.3 $ 0.0 2.3 0.0 0.0
Balance at Mar. 31, 2018 $ 3,842.1 $ 2.0 $ 1,115.1 $ 2,748.0 $ (23.0)
Common Stock, Shares, Outstanding   199.7