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Stockholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) as of December 31, 2014, 2013 and 2012, is as follows:
(millions) |  |  | Total |  |  |  | Translation Adjustments |  |  |  | Postretirement Plans |
Balance at December 31, 2011 |  | $ | (3,700.9 | ) |  | $ | (649.1 | ) |  | $ | (3,051.8 | )
Other comprehensive income before reclassifications |  |  | (275.9 | ) |  |  | 14.8 |  |  |  | (290.7 | )
Amounts reclassified from accumulated other comprehensive income |  |  | (156.8 | ) |  |  | – |  |  |  | (156.8 | )
Current period other comprehensive income |  |  | (432.7 | ) |  |  | 14.8 |  |  |  | (447.5 | )
Balance at December 31, 2012 |  |  | (4,133.6 | ) |  |  | (634.3 | ) |  |  | (3,499.3 | )
Other comprehensive income before reclassifications |  |  | 985.1 |  |  |  | (42.5 | ) |  |  | 1,027.6 |
Amounts reclassified from accumulated other comprehensive income |  |  | (184.9 | ) |  |  | – |  |  |  | (184.9 | )
Current period other comprehensive income |  |  | 800.2 |  |  |  | (42.5 | ) |  |  | 842.7 |
Balance at December 31, 2013 |  |  | (3,333.4 | ) |  |  | (676.8 | ) |  |  | (2,656.6 | )
Other comprehensive income before reclassifications |  |  | (638.8 | ) |  |  | (61.0 | ) |  |  | (577.8 | )
Amounts reclassified from accumulated other comprehensive income |  |  | (141.2 | ) |  |  | – |  |  |  | (141.2 | )
Current period other comprehensive income |  |  | (780.0 | ) |  |  | (61.0 | ) |  |  | (719.0 | )
Balance at December 31, 2014 |  | $ | (4,113.4 | ) |  | $ | (737.8 | ) |  | $ | (3,375.6 | )
Amounts Related to Postretirement Plans Not Reclassified in Entirety out of Accumulated Other Comprehensive Income | Amounts related to postretirement plans not reclassified in their entirety out of accumulated other comprehensive income were as follows:
Year ended December 31 (millions) |  | 2014 |  |  | 2013 |
Amortization of prior service cost* |  | $ | (.7 | ) |  | $ | .4 |
Amortization of actuarial losses* |  |  | 148.3 |  |  |  | 191.4 |
Curtailment gain* |  |  | (.6 | ) |  |  | – |
Total before tax |  |  | 147.0 |  |  |  | 191.8 |
Income tax benefit |  |  | (5.8 | ) |  |  | (6.9 | )
Net of tax |  | $ | 141.2 |  |  | $ | 184.9 |
* These items are included in net periodic postretirement cost (see note 16).
Changes in Preferred Stock, Common Stock and Treasury Stock | The following table summarizes the changes in preferred stock, common stock and treasury stock during the three years ended December 31, 2014:
(millions) |  |  | Preferred Stock |  |  |  | Common Stock |  |  |  | Treasury Stock |
Balance at December 31, 2011 |  |  | 2.6 |  |  |  | 43.8 |  |  |  | .3 |
Stock-based compensation |  |  | – |  |  |  | .5 |  |  |  | .1 |
Balance at December 31, 2012 |  |  | 2.6 |  |  |  | 44.3 |  |  |  | .4 |
Common stock repurchases |  |  | – |  |  |  | – |  |  |  | .6 |
Stock-based compensation |  |  | – |  |  |  | .8 |  |  |  | .1 |
Balance at December 31, 2013 |  |  | 2.6 |  |  |  | 45.1 |  |  |  | 1.1 |
Common stock repurchases |  |  | – |  |  |  | – |  |  |  | 1.6 |
Stock-based compensation |  |  | – |  |  |  | .4 |  |  |  | – |
Preferred stock conversion |  |  | (2.6 | ) |  |  | 6.9 |  |  |  | – |
Balance at December 31, 2014 |  |  | – |  |  |  | 52.4 |  |  |  | 2.7 |

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