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Consolidated Statements of Equity - USD ($) $ in Millions | Total | Total Common Shareholders' Equity | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income | Preferred Stock of Subsidiary
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 4,450.1 | $ 4,419.7 | $ 2.3 | $ 300.1 | $ 4,117.0 | $ 0.3 | $ 30.4
Equity |  |  |  |  |  |  |
Net income attributed to common shareholders | 638.5 | 638.5 | 0.0 | 0.0 | 638.5 | 0.0 | 0.0
Other comprehensive (loss) income, net of tax | 4.3 | 4.3 | 0.0 | 0.0 | 0.0 | 4.3 | 0.0
Common stock dividends | (455.4) | (455.4) | 0.0 | 0.0 | (455.4) | 0.0 | 0.0
Exercise of stock options | 30.1 | 30.1 | 0.0 | 30.1 | 0.0 | 0.0 | 0.0
Issuance of common stock for the acquisition of Integrys | 4,072.9 | 4,072.9 | 0.9 | 4,072.0 | 0.0 | 0.0 | 0.0
Purchase of common stock | (74.7) | (74.7) | 0.0 | (74.7) | 0.0 | 0.0 | 0.0
Addition of WPS preferred stock | 51.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 51.1
Redemption of WPS preferred stock | (52.7) | (1.6) | 0.0 | (1.6) | 0.0 | 0.0 | (51.1)
Stock-based compensation and other | 21.0 | 21.0 | 0.0 | 21.3 | (0.3) | 0.0 | 0.0
Balance at Dec. 31, 2015 | 8,685.2 | 8,654.8 | 3.2 | 4,347.2 | 4,299.8 | 4.6 | 30.4
Equity |  |  |  |  |  |  |
Net income attributed to common shareholders | 939.0 | 939.0 | 0.0 | 0.0 | 939.0 | 0.0 | 0.0
Other comprehensive (loss) income, net of tax | (1.7) | (1.7) | 0.0 | 0.0 | 0.0 | (1.7) | 0.0
Common stock dividends | (624.9) | (624.9) | 0.0 | 0.0 | (624.9) | 0.0 | 0.0
Exercise of stock options | 41.6 | 41.6 | 0.0 | 41.6 | 0.0 | 0.0 | 0.0
Purchase of common stock | (108.0) | (108.0) | 0.0 | (108.0) | 0.0 | 0.0 | 0.0
Stock-based compensation and other | 29.0 | 29.0 | 0.0 | 29.0 | 0.0 | 0.0 | 0.0
Balance at Dec. 31, 2016 | 8,960.2 | 8,929.8 | 3.2 | 4,309.8 | 4,613.9 | 2.9 | 30.4
Equity |  |  |  |  |  |  |
Cumulative effect adjustment from adoption of ASU 2016-09 | 15.7 | 15.7 | 0.0 | 0.0 | 15.7 | 0.0 | 0.0
Net income attributed to common shareholders | 1,203.7 | 1,203.7 | 0.0 | 0.0 | 1,203.7 | 0.0 | 0.0
Other comprehensive (loss) income, net of tax | 0.0 |  |  |  |  |  |
Common stock dividends | (656.5) | (656.5) | 0.0 | 0.0 | (656.5) | 0.0 | 0.0
Exercise of stock options | 30.8 | 30.8 | 0.0 | 30.8 | 0.0 | 0.0 | 0.0
Purchase of common stock | (71.3) | (71.3) | 0.0 | (71.3) | 0.0 | 0.0 | 0.0
Stock-based compensation and other | 9.2 | 9.2 | 0.0 | 9.2 | 0.0 | 0.0 | 0.0
Balance at Dec. 31, 2017 | $ 9,491.8 | $ 9,461.4 | $ 3.2 | $ 4,278.5 | $ 5,176.8 | $ 2.9 | $ 30.4

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