The following table provides the changes in the Corporation’s outstanding common shares:
| 2013 | 2012 | 2011 | ||||||||||
| (In millions) | ||||||||||||
|
Balance at January 1 |
341.5 | 340.0 | 337.7 | |||||||||
|
Activity related to restricted common stock awards, net |
0.8 | 1.3 | 0.6 | |||||||||
|
Stock options exercised |
2.3 | 0.2 | 1.7 | |||||||||
|
Shares repurchased* |
(19.3 | ) | — | — | ||||||||
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|
Balance at December 31 |
325.3 | 341.5 | 340.0 | |||||||||
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| * |
See Note 18, Share Repurchase Plan in the notes to the Consolidated Financial Statements. |