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Consolidated Statements of Equity - USD ($) $ in Millions | Total | Total Equity | Total Common Shareholders' Equity | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Income | AOCI Attributable to Parent, Other | ASU 2018-02 Reclassification from AOCI, Tax Effect | Preferred Stock of Subsidiary | Noncontrolling Interests
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 |  | $ 8,685.2 | $ 8,654.8 | $ 3.2 | $ 4,347.2 | $ 4,299.8 | $ 4.6 |  |  | $ 30.4 | $ 0.0
Equity |  |  |  |  |  |  |  |  |  |  |
Net income attributed to common shareholders | $ 939.0 | 939.0 | 939.0 | 0.0 | 0.0 | 939.0 | 0.0 |  |  | 0.0 | 0.0
Other comprehensive loss, net of tax | (1.7) |  | (1.7) | 0.0 | 0.0 | 0.0 | (1.7) |  |  | 0.0 | 0.0
Common stock dividends |  | (624.9) | (624.9) | 0.0 | 0.0 | (624.9) | 0.0 |  |  | 0.0 | 0.0
Exercise of stock options |  | 41.6 | 41.6 | 0.0 | 41.6 | 0.0 | 0.0 |  |  | 0.0 | 0.0
Purchase of common stock | (108.0) | (108.0) | (108.0) | 0.0 | (108.0) | 0.0 | 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 | 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 | 0.0
Equity |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment from new accounting principle |  | 15.7 | 15.7 | 0.0 | 0.0 | 15.7 | 0.0 |  |  | 0.0 | 0.0
Net income attributed to common shareholders | 1,203.7 | 1,203.7 | 1,203.7 | 0.0 | 0.0 | 1,203.7 | 0.0 |  |  | 0.0 | 0.0
Other comprehensive loss, net of tax | 0.0 |  |  |  |  |  |  |  |  |  |
Common stock dividends |  | (656.5) | (656.5) | 0.0 | 0.0 | (656.5) | 0.0 |  |  | 0.0 | 0.0
Exercise of stock options |  | 30.8 | 30.8 | 0.0 | 30.8 | 0.0 | 0.0 |  |  | 0.0 | 0.0
Purchase of common stock | (71.3) | (71.3) | (71.3) | 0.0 | (71.3) | 0.0 | 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 | 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 | 0.0
Equity |  |  |  |  |  |  |  |  |  |  |
Cumulative effect adjustment from new accounting principle |  | 0.0 | 0.0 | 0.0 | 0.0 | (0.6) |  |  | $ 0.6 | 0.0 | 0.0
Net income attributed to common shareholders | 1,059.3 | 1,059.3 | 1,059.3 | 0.0 | 0.0 | 1,059.3 | 0.0 |  |  | 0.0 | 0.0
Other comprehensive loss, net of tax | (5.5) | (6.1) | (6.1) | 0.0 | 0.0 | 0.0 |  | $ (6.1) |  | 0.0 | 0.0
Common stock dividends |  | (697.3) | (697.3) | 0.0 | 0.0 | (697.3) | 0.0 |  |  | 0.0 | 0.0
Exercise of stock options |  | 29.1 | 29.1 | 0.0 | 29.1 | 0.0 | 0.0 |  |  | 0.0 | 0.0
Purchase of common stock | $ (72.4) | (72.4) | (72.4) | 0.0 | (72.4) | 0.0 | 0.0 |  |  | 0.0 | 0.0
Acquisition of noncontrolling interests |  | 23.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |  |  | 0.0 | 23.8
Stock-based compensation and other |  | 14.5 | 14.9 | 0.0 | 14.9 | 0.0 | 0.0 |  |  | 0.0 | (0.4)
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

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