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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 | 337.4 | 0.0 | 0.0 | 337.4 | 0.0
Other comprehensive income, net of tax | 0.9 | 0.0 | 0.0 | 0.0 | 0.9
Dividends declared on common stock | (139.5) | 0.0 | 0.0 | (139.5) | 0.0
Issuance of common stock | 10.1 | 0.0 | 10.1 | 0.0 | 0.0
Stock-based compensation | (3.0) | 0.0 | (3.0) | 0.0 | 0.0
Balance at Sep. 30, 2014 | 3,243.0 | 2.0 | 1,078.7 | 2,189.6 | (27.3)
Balance at Dec. 31, 2014 | 3,244.4 | 2.0 | 1,085.6 | 2,198.2 | (41.4)
Changes in Stockholders' Equity |  |  |  |  |
Net income | 241.9 | 0.0 | 0.0 | 241.9 | 0.0
Other comprehensive income, net of tax | 5.3 | 0.0 | 0.0 | 0.0 | 5.3
Dividends declared on common stock | (154.8) | 0.0 | 0.0 | (154.8) | 0.0
Issuance of common stock | 7.2 | 0.0 | 7.2 | 0.0 | 0.0
Stock-based compensation | 9.4 | 0.0 | 9.4 | 0.0 | 0.0
Balance at Sep. 30, 2015 | $ 3,353.4 | $ 2.0 | $ 1,102.2 | $ 2,285.3 | $ (36.1)

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