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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 | 140.8 | $ 0.0 | 0.0 | 140.8 | 0.0
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Other comprehensive income, net of tax | 1.4 | $ 0.0 | 0.0 | 0.0 | 1.4
Dividends declared on common stock | (120.8) | $ 0.0 | 0.0 | (120.8) | 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares |  | 0.0 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 22.3 | $ 0.0 | 0.0 | 22.3 | 0.0
Accounting Pronouncement or Change in Accounting Principal, effect of Adoption, Quantification, number of shares |  | 0.0 |  |  |
Stock-based compensation | 4.5 | $ 0.0 | 4.5 | 0.0 | 0.0
Balance at Jun. 30, 2017 | 3,492.0 | $ 2.0 | 1,108.3 | 2,409.6 | (27.9)
Common Stock, Shares, Outstanding |  | 199.7 |  |  |
Common Stock, Shares, Outstanding |  | 199.7 |  |  |
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares |  | 0.0 |  |  |
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 | 165.7 | $ 0.0 | 0.0 | 165.7 | 0.0
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Other comprehensive income, net of tax | 0.9 | $ 0.0 | 0.0 | 0.0 | 0.9
Dividends declared on common stock | (132.9) | $ 0.0 | 0.0 | (132.9) | 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares |  | 0.0 |  |  |
Stock-based compensation | 5.3 | $ 0.0 | 5.3 | 0.0 | 0.0
Balance at Jun. 30, 2018 | $ 3,890.1 | $ 2.0 | $ 1,118.1 | $ 2,792.3 | $ (22.3)
Common Stock, Shares, Outstanding |  | 199.7 |  |  |

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