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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ 0.0 | $ 0.0 |
Balance at Beginning of Period, as Adjusted |  |  |  | (51.0) | 8,744.0 |
Balance at Beginning of Period at Dec. 31, 2016 |  | $ 30.4 | $ 2,272.8 | (51.0) | 8,744.0 | $ (2,028.2)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Common Stock Activity |  |  | 4.6 |  |  |
Other Comprehensive Income (Loss) | $ 51.4 |  |  | 51.4 |  |
Net Income | 229.9 |  |  |  | 229.9 |
Dividends to Stockholders (per common share: $0.23; $0.20) |  |  |  |  | (46.5) |
Purchases of Treasury Stock | (100.0) |  |  |  |  | (100.0)
Balance at End of Period at Mar. 31, 2017 | 9,107.4 | 30.4 | 2,277.4 | 0.4 | 8,927.4 | (2,128.2)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | (17.5) | 14.5 |
Balance at Beginning of Period, as Adjusted |  |  |  | 110.0 | 9,556.7 |
Balance at Beginning of Period at Dec. 31, 2017 |  | 30.5 | 2,303.3 | 127.5 | 9,542.2 | (2,428.6)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  | (0.9) |  |  |
Other Comprehensive Income (Loss) | (192.4) |  |  | (192.4) |  |
Net Income | 273.5 |  |  |  | 273.5 |
Dividends to Stockholders (per common share: $0.23; $0.20) |  |  |  |  | (52.4) |
Purchases of Treasury Stock | (100.2) |  |  |  |  | (100.2)
Balance at End of Period at Mar. 31, 2018 | $ 9,499.5 | $ 30.5 | $ 2,302.4 | $ (82.4) | $ 9,777.8 | $ (2,528.8)

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