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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) (USD $) In Millions, unless otherwise specified | Total | Common Stock | Premium on Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interest | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2012 | $ 3,072.4 | $ 1.0 | $ 1,046.4 | $ 1,772.4 | $ (49.1) | $ 305.2 | $ (3.5)
Changes in Stockholders' Equity |  |  |  |  |  |  |
Net income | 121.0 | 0 | 0 | 114.8 | 0 | 6.2 | 0
Other comprehensive income, net of tax | 2.0 | 0 | 0 | 0 | 1.9 | 0.1 | 0
Dividends declared on common stock | (82.8) | 0 | 0 | (82.8) | 0 | 0 | 0
Issuance of common stock | 6.9 | 0 | 6.9 | 0 | 0 | 0 | 0
Stock-based compensation and other | (5.7) | 0 | (8.4) | 0 | 0 | (0.8) | 3.5
Contributions from noncontrolling interest partners | 107.0 | 0 | 22.5 | 0 | 0 | 84.5 | 0
Distributions to noncontrolling interest partners | (2.5) | 0 | 0 | 0 | 0 | (2.5) | 0
Deconsolidation of Enogex Holdings | (398.3) | 0 | 0 | 0.5 | (6.1) | (392.7) | 0
Deferred income taxes attributable to contributions from noncontrolling interest partners | (8.7) | 0 | (8.7) | 0 | 0 | 0 | 0
2-for-1 forward stock split | 0 | 1.0 | (1.0) | 0 | 0 | 0 | 0
Balance at Jun. 30, 2013 | 2,811.3 | 2.0 | 1,057.7 | 1,804.9 | (53.3) | 0 | 0
Balance at Dec. 31, 2013 | 3,037.1 | 2.0 | 1,071.6 | 1,991.7 | (28.2) | 0 | 0
Changes in Stockholders' Equity |  |  |  |  |  |  |
Net income | 150.1 | 0 | 0 | 150.1 | 0 | 0 | 0
Other comprehensive income, net of tax | 0.6 | 0 | 0 | 0 | 0.6 | 0 | 0
Dividends declared on common stock | (89.7) | 0 | 0 | (89.7) | 0 | 0 | 0
Issuance of common stock | 6.7 | 0 | 6.7 | 0 | 0 | 0 | 0
Stock-based compensation and other | (5.0) | 0 | (5.0) | 0 | 0 | 0 | 0
Contributions from noncontrolling interest partners | 0 |  |  |  |  |  |
Distributions to noncontrolling interest partners | 0 |  |  |  |  |  |
Balance at Jun. 30, 2014 | $ 3,099.8 | $ 2.0 | $ 1,073.3 | $ 2,052.1 | $ (27.6) | $ 0 | $ 0

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