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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 | 324.2 | $ 0.0 | 0.0 | 324.2 | 0.0
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Other comprehensive income, net of tax | 9.0 | $ 0.0 | 0.0 | 0.0 | 9.0
Dividends declared on common stock | (187.2) | $ 0.0 | 0.0 | (187.2) | 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 | 4.7 | $ 0.0 | 4.7 | 0.0 | 0.0
Balance at Sep. 30, 2017 | 3,616.8 | $ 2.0 | 1,108.5 | 2,526.6 | (20.3)
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 | 370.8 | $ 0.0 | 0.0 | 370.8 | 0.0
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Other comprehensive income, net of tax | 4.3 | $ 0.0 | 0.0 | 0.0 | 4.3
Dividends declared on common stock | (205.8) | $ 0.0 | 0.0 | (205.8) | 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares |  | 0.0 |  |  |
Stock-based compensation | 9.2 | $ 0.0 | 9.2 | 0.0 | 0.0
Balance at Sep. 30, 2018 | $ 4,029.6 | $ 2.0 | $ 1,122.0 | $ 2,924.5 | $ (18.9)
Common Stock, Shares, Outstanding |  | 199.7 |  |  |

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