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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)
--- | --- | --- | --- | --- | ---
Changes in Stockholders' Equity |  |  |  |  |
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 |  |  |  |  |
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Number of Shares |  | 0.0 |  |  |
Net income | 55.0 | $ 0.0 | 0.0 | 55.0 | 0.0
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 ($0.3650 per share) | (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)
Balance at Dec. 31, 2017 | 3,851.1 | 2.0 | 1,112.8 | 2,759.5 | (23.2)
Changes in Stockholders' Equity |  |  |  |  |
Net income | 165.7 |  |  | 165.7 |
Other comprehensive income net of tax | 0.9 |  |  |  |
Balance at Jun. 30, 2018 | 3,890.1 | $ 2.0 | 1,118.1 | 2,792.3 | (22.3)
Changes in Stockholders' Equity |  |  |  |  |
Common Stock, Shares, Outstanding |  | 199.7 |  |  |
Balance at Mar. 31, 2018 | 3,842.1 | $ 2.0 | 1,115.1 | 2,748.0 | (23.0)
Changes in Stockholders' Equity |  |  |  |  |
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Number of Shares |  | 0.0 |  |  |
Net income | 110.7 | $ 0.0 | 0.0 | 110.7 | 0.0
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Other comprehensive income net of tax | 0.7 | $ 0.0 | 0.0 | 0.0 | 0.7
Dividends declared on common stock ($0.3650 per share) | (66.4) | $ 0.0 | 0.0 | (66.4) | 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares |  | 0.0 |  |  |
Stock-based compensation | 3.0 | $ 0.0 | 3.0 | 0.0 | 0.0
Balance at Jun. 30, 2018 | 3,890.1 | $ 2.0 | 1,118.1 | 2,792.3 | (22.3)
Changes in Stockholders' Equity |  |  |  |  |
Common Stock, Shares, Outstanding |  | 199.7 |  |  |
Common Stock, Shares, Outstanding |  | 199.7 |  |  |
Balance at Dec. 31, 2018 | 4,005.1 | $ 2.0 | 1,125.7 | 2,906.3 | (28.9)
Changes in Stockholders' Equity |  |  |  |  |
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Number of Shares |  | 0.0 |  |  |
Net income | 47.1 | $ 0.0 | 0.0 | 47.1 | 0.0
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Other comprehensive income net of tax | 6.8 | $ 0.0 | 0.0 | 0.0 | 6.8
Dividends declared on common stock ($0.3650 per share) | (75.6) | $ 0.0 | 0.0 | (75.6) | 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares |  | 0.5 |  |  |
Stock-based compensation | (7.2) | $ 0.0 | (7.2) | 0.0 | 0.0
Balance at Mar. 31, 2019 | 3,976.2 | 2.0 | 1,118.5 | 2,877.8 | (22.1)
Balance at Dec. 31, 2018 | 4,005.1 | 2.0 | 1,125.7 | 2,906.3 | (28.9)
Changes in Stockholders' Equity |  |  |  |  |
Net income | 147.3 |  |  | 147.3 |
Other comprehensive income net of tax | 7.8 |  |  |  |
Balance at Jun. 30, 2019 | 4,007.2 | $ 2.0 | 1,121.4 | 2,904.9 | (21.1)
Changes in Stockholders' Equity |  |  |  |  |
Common Stock, Shares, Outstanding |  | 200.2 |  |  |
Balance at Mar. 31, 2019 | 3,976.2 | $ 2.0 | 1,118.5 | 2,877.8 | (22.1)
Changes in Stockholders' Equity |  |  |  |  |
Net Income (Loss), Including portion attributable to noncontrolling interest, Number of Shares |  | 0.0 |  |  |
Other Comprehensive Income (Loss), Net of Tax, Number of Shares |  | 0.0 |  |  |
Net income | 100.2 | $ 0.0 | 0.0 | 100.2 | 0.0
Dividends, Common Stock, Cash, Number of Shares |  | 0.0 |  |  |
Other comprehensive income net of tax | 1.0 | $ 0.0 | 0.0 | 0.0 | 1.0
Dividends declared on common stock ($0.3650 per share) | (73.1) | $ 0.0 | 0.0 | (73.1) | 0.0
Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Number of Shares |  | 0.0 |  |  |
Stock-based compensation | 2.9 | $ 0.0 | 2.9 | 0.0 | 0.0
Balance at Jun. 30, 2019 | $ 4,007.2 | $ 2.0 | $ 1,121.4 | $ 2,904.9 | $ (21.1)
Changes in Stockholders' Equity |  |  |  |  |
Common Stock, Shares, Outstanding |  | 200.2 |  |  |

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