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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 |  |  |

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