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CONDENSED 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 | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 9,491.8 | $ 9,461.4 | $ 3.2 | $ 4,278.5 | $ 5,176.8 | $ 2.9 | $ 30.4 | $ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income attributed to common shareholders | 390.1 | 390.1 | 0.0 | 0.0 | 390.1 | 0.0 | 0.0 | 0.0
Other comprehensive income (loss) | 1.7 | 1.7 | 0.0 | 0.0 | 0.0 | 1.7 | 0.0 | 0.0
Common stock dividends | (174.2) | (174.2) | 0.0 | 0.0 | (174.2) | 0.0 | 0.0 | 0.0
Exercise of stock options | 2.1 | 2.1 | 0.0 | 2.1 | 0.0 | 0.0 | 0.0 | 0.0
Purchase of common stock | (15.8) | (15.8) | 0.0 | (15.8) | 0.0 | 0.0 | 0.0 | 0.0
Stock-based compensation and other | 2.5 | 2.5 | 0.0 | 2.5 | 0.0 | 0.0 | 0.0 | 0.0
Balance at Mar. 31, 2018 | 9,698.2 | 9,667.8 | 3.2 | 4,267.3 | 5,392.7 | 4.6 | 30.4 | 0.0
Balance at Dec. 31, 2018 | 9,842.7 | 9,788.9 | 3.2 | 4,250.1 | 5,538.2 | (2.6) | 30.4 | 23.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income attributed to common shareholders | 420.1 | 420.1 | 0.0 | 0.0 | 420.1 | 0.0 | 0.0 | 0.0
Other comprehensive income (loss) | (1.4) | (1.4) | 0.0 | 0.0 | 0.0 | (1.4) | 0.0 | 0.0
Common stock dividends | (186.2) | (186.2) | 0.0 | 0.0 | (186.2) | 0.0 | 0.0 | 0.0
Exercise of stock options | 32.6 | 32.6 | 0.0 | 32.6 | 0.0 | 0.0 | 0.0 | 0.0
Purchase of common stock | (70.7) | (70.7) | 0.0 | (70.7) | 0.0 | 0.0 | 0.0 | 0.0
Acquisition of a noncontrolling interest | 69.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 69.0
Capital contributions from noncontrolling interest | 4.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 4.8
Stock-based compensation and other | 1.2 | 1.2 | 0.0 | 1.2 | 0.0 | 0.0 | 0.0 | 0.0
Balance at Mar. 31, 2019 | $ 10,112.1 | $ 9,984.5 | $ 3.2 | $ 4,213.2 | $ 5,772.1 | $ (4.0) | $ 30.4 | $ 97.2

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