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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, 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)
Balance at Dec. 31, 2015 | 3,326.0 | 2.0 | 1,099.3 | 2,259.8 | (35.1)
Changes in Stockholders' Equity |  |  |  |  |
Net income | 96.7 | 0.0 | 0.0 | 96.7 | 0.0
Other comprehensive income, net of tax | 5.7 | 0.0 | 0.0 | 0.0 | 5.7
Dividends declared on common stock | (109.8) | 0.0 | 0.0 | (109.8) | 0.0
Stock-based compensation | 3.2 | 0.0 | 3.2 | 0.0 | 0.0
Balance at Jun. 30, 2016 | $ 3,321.8 | $ 2.0 | $ 1,102.5 | $ 2,246.7 | $ (29.4)

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