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Stockholders' equity | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Stockholders' equity | Stockholders’ equity The company has 100 million authorized shares of common stock, par value $.01 per share, and 40 million shares of authorized preferred stock, par value $1 per share, issuable in series. At December 31, 2016, 35.7 million shares of unissued common stock of the company were reserved for stock-based incentive plans and the company's convertible senior notes. 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 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). 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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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 + Details
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