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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 interests
--- | --- | --- | --- | --- | --- | --- | --- | ---
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
Statements of equity |  |  |  |  |  |  |  |
Net income attributed to common shareholders | 420.1 | 420.1 | 0.0 | 0.0 | 420.1 | 0.0 | 0.0 | 0.0
Net loss attributed to noncontrolling interests | 0.0 |  |  |  |  |  |  |
Other comprehensive 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
Balance at Dec. 31, 2019 | 10,254.6 | 10,113.4 | 3.2 | 4,186.6 | 5,927.7 | (4.1) | 30.4 | 110.8
Statements of equity |  |  |  |  |  |  |  |
Net income attributed to common shareholders | 452.5 | 452.5 | 0.0 | 0.0 | 452.5 | 0.0 | 0.0 | 0.0
Net loss attributed to noncontrolling interests | (0.2) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | (0.2)
Other comprehensive loss | (3.0) | (3.0) | 0.0 | 0.0 | 0.0 | (3.0) | 0.0 | 0.0
Common stock dividends | (199.5) | (199.5) | 0.0 | 0.0 | (199.5) | 0.0 | 0.0 | 0.0
Exercise of stock options | 16.0 | 16.0 | 0.0 | 16.0 | 0.0 | 0.0 | 0.0 | 0.0
Purchase of common stock | (40.4) | (40.4) | 0.0 | (40.4) | 0.0 | 0.0 | 0.0 | 0.0
Distributions to noncontrolling interests | (0.5) | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | (0.5)
Stock-based compensation and other | 5.1 | 5.1 | 0.0 | 5.1 | 0.0 | 0.0 | 0.0 | 0.0
Balance at Mar. 31, 2020 | $ 10,484.6 | $ 10,344.1 | $ 3.2 | $ 4,167.3 | $ 6,180.7 | $ (7.1) | $ 30.4 | $ 110.1

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