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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions | Total | Common Stock | Premium on Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2013 | $ 3,037.1 | $ 2.0 | $ 1,071.6 | $ 1,991.7 | $ (28.2)
Changes in Stockholders' Equity |  |  |  |  |
Net income | 150.1 | 0.0 | 0.0 | 150.1 | 0.0
Other comprehensive income, net of tax | 0.6 | 0.0 | 0.0 | 0.0 | 0.6
Dividends declared on common stock | (89.7) | 0.0 | 0.0 | (89.7) | 0.0
Issuance of common stock | 6.7 | 0.0 | 6.7 | 0.0 | 0.0
Stock-based compensation | (5.0) | 0.0 | (5.0) | 0.0 | 0.0
Balance at Jun. 30, 2014 | 3,099.8 | 2.0 | 1,073.3 | 2,052.1 | (27.6)
Balance at Dec. 31, 2014 | 3,244.4 | 2.0 | 1,085.6 | 2,198.2 | (41.4)
Changes in Stockholders' Equity |  |  |  |  |
Net income | 130.7 | 0.0 | 0.0 | 130.7 | 0.0
Other comprehensive income, net of tax | 0.9 | 0.0 | 0.0 | 0.0 | 0.9
Dividends declared on common stock | (99.8) | 0.0 | 0.0 | (99.8) | 0.0
Issuance of common stock | 6.8 | 0.0 | 6.8 | 0.0 | 0.0
Stock-based compensation | 3.0 | 0.0 | 3.0 | 0.0 | 0.0
Balance at Jun. 30, 2015 | $ 3,286.0 | $ 2.0 | $ 1,095.4 | $ 2,229.1 | $ (40.5)

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