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Stockholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | Accumulated other comprehensive income (loss) as of December 31, 2016, 2015 and 2014, is as follows:
|  | Total |  |  | Translation Adjustments |  |  | Postretirement Plans |
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 | )
Other comprehensive income before reclassifications |  | 346.2 |  |  | (96.0 | ) |  | 442.2 |
Amounts reclassified from accumulated other comprehensive income |  | (178.1 | ) |  | — |  |  | (178.1 | )
Current period other comprehensive income |  | 168.1 |  |  | (96.0 | ) |  | 264.1 |
Balance at December 31, 2015 |  | (3,945.3 | ) |  | (833.8 | ) |  | (3,111.5 | )
Other comprehensive income before reclassifications |  | (64.9 | ) |  | (93.3 | ) |  | 28.4 |
Amounts reclassified from accumulated other comprehensive income |  | (142.6 | ) |  | — |  |  | (142.6 | )
Current period other comprehensive income |  | (207.5 | ) |  | (93.3 | ) |  | (114.2 | )
Balance at December 31, 2016 |  | $ | (4,152.8 | ) |  | $ | (927.1 | ) |  | $ | (3,225.7 | )
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, |  | 2016 |  |  | 2015 |
Amortization of prior service cost* |  | $ | 5.6 |  |  | $ | 3.1 |
Amortization of actuarial losses* |  | (155.2 | ) |  | (189.7 | )
Curtailment gain* |  | 2.0 |  |  | — |
Total before tax |  | (147.6 | ) |  | (186.6 | )
Income tax benefit |  | 5.0 |  |  | 8.5 |
Net of tax |  | $ | (142.6 | ) |  | $ | (178.1 | )
* 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 shares of preferred stock, common stock and treasury stock during the three years ended December 31, 2016
|  | Preferred Stock |  |  | Common Stock |  |  | Treasury Stock |
Balance at December 31, 2013 |  | 2.6 |  |  | 45.1 |  |  | 1.1 |
Common stock repurchases |  | — |  |  | — |  |  | 1.6 |
Stock-based compensation |  | — |  |  | 0.4 |  |  | — |
Preferred stock conversion |  | (2.6 | ) |  | 6.9 |  |  | — |
Balance at December 31, 2014 |  | — |  |  | 52.4 |  |  | 2.7 |
Stock-based compensation |  | — |  |  | 0.2 |  |  | — |
Balance at December 31, 2015 |  | — |  |  | 52.6 |  |  | 2.7 |
Stock-based compensation |  | — |  |  | 0.2 |  |  | — |
Balance at December 31, 2016 |  | — |  |  | 52.8 |  |  | 2.7 |

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