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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Premium on Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Common Stock, Shares, Outstanding |  | 199.4 |  |  |
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares |  | 0.0 |  |  |
Balance at Dec. 31, 2014 | $ 3,244.4 | $ 2.0 | $ 1,085.6 | $ 2,198.2 | $ (41.4)
Comprehensive income (loss) |  |  |  |  |
Net income | 271.3 | $ 0.0 | 0.0 | 271.3 | 0.0
Other Comprehensive Income (Loss), Net of Tax, Number of Shares |  | 0.0 |  |  |
Other comprehensive income, net of tax | 6.3 | $ 0.0 | 0.0 | 0.0 | 6.3
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Dividends declared on common stock | (209.7) | $ 0.0 | 0.0 | (209.7) | 0.0
Stock Issued During Period, Shares, New Issues |  | 0.2 |  |  |
Expense of common stock | 7.2 | $ 0.0 | 7.2 | 0.0 | 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares |  | 0.1 |  |  |
Stock-based compensation | 6.5 | $ 0.0 | 6.5 | 0.0 | 0.0
Balance at Dec. 31, 2015 | 3,326.0 | $ 2.0 | 1,099.3 | 2,259.8 | (35.1)
Common Stock, Shares, Outstanding |  | 199.7 |  |  |
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares |  | 0.0 |  |  |
Comprehensive income (loss) |  |  |  |  |
Net income | 338.2 | $ 0.0 | 0.0 | 338.2 | 0.0
Other Comprehensive Income (Loss), Net of Tax, Number of Shares |  | 0.0 |  |  |
Other comprehensive income, net of tax | 5.8 | $ 0.0 | 0.0 | 0.0 | 5.8
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Dividends declared on common stock | (230.7) | $ 0.0 | 0.0 | (230.7) | 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares |  | 0.0 |  |  |
Stock-based compensation | 4.5 | $ 0.0 | 4.5 | 0.0 | 0.0
Balance at Dec. 31, 2016 | $ 3,443.8 | $ 2.0 | 1,103.8 | 2,367.3 | (29.3)
Common Stock, Shares, Outstanding | 199.7 | 199.7 |  |  |
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares |  | 0.0 |  |  |
Comprehensive income (loss) |  |  |  |  |
Net income | $ 619.0 | $ 0.0 | 0.0 | 619.0 | 0.0
Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification, Number of Shares |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Number of Shares |  | 0.0 |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 22.3 | $ 0.0 | 0.0 | 26.8 | (4.5)
Other comprehensive income, net of tax | 10.6 | $ 0.0 | 0.0 | 0.0 | 10.6
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Dividends declared on common stock | (253.6) | $ 0.0 | 0.0 | (253.6) | 0.0
Expense of common stock | (0.1) | $ 0.0 | (0.1) | 0.0 | 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares |  | 0.0 |  |  |
Stock Issued During Period, Value, New Issues, Number of Shares |  | 0.0 |  |  |
Stock-based compensation | 9.1 | $ 0.0 | 9.1 | 0.0 | 0.0
Balance at Dec. 31, 2017 | $ 3,851.1 | $ 2.0 | $ 1,112.8 | $ 2,759.5 | $ (23.2)
Common Stock, Shares, Outstanding | 199.7 | 199.7 |  |  |

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