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Stockholders' equity | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Stockholders' equity | Stockholders’ equity The company has 150 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, 2017, 35.1 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, 2017, 2016 and 2015, is as follows:
|  | Total |  |  | Translation Adjustments |  |  | Postretirement Plans |
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 | )
Other comprehensive income before reclassifications |  | 506.8 |  |  | 121.9 |  |  | 384.9 |
Amounts reclassified from accumulated other comprehensive income |  | (169.8 | ) |  | (11.8 | ) |  | (158.0 | )
Current period other comprehensive income |  | 337.0 |  |  | 110.1 |  |  | 226.9 |
Balance at December 31, 2017 |  | $ | (3,815.8 | ) |  | $ | (817.0 | ) |  | $ | (2,998.8 | )
Amounts reclassified out of accumulated other comprehensive income for the three years ended December 31, 2017 are as follows:
Year ended December 31, |  | 2017 |  |  | 2016 |  |  | 2015 |
Translation Adjustments: |  |  |  |  |  |
Adjustment for substantial completion of liquidation of foreign subsidiaries(a) |  | $ | (11.8 | ) |  | $ | — |  |  | $ | — |
Postretirement Plans: |  |  |  |  |  |
Amortization of prior service cost(b) |  | 5.6 |  |  | 5.6 |  |  | 3.1 |
Amortization of actuarial losses(b) |  | (174.1 | ) |  | (155.2 | ) |  | (189.7 | )
Curtailment gain(b) |  | 5.4 |  |  | 2.0 |  |  | — |
Total before tax |  | (174.9 | ) |  | (147.6 | ) |  | (186.6 | )
Income tax benefit |  | 5.1 |  |  | 5.0 |  |  | 8.5 |
Total reclassifications for the period |  | $ | (169.8 | ) |  | $ | (142.6 | ) |  | $ | (178.1 | )
(a) Reported in Other income (expense), net in the consolidated statements of income (b) These items are included in net periodic postretirement cost (see Note 16). The following table summarizes the changes in shares of common stock and treasury stock during the three years ended December 31, 2017:
|  | Common Stock |  |  | Treasury Stock |
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 |
Stock-based compensation |  | 0.6 |  |  | 0.2 |
Balance at December 31, 2017 |  | 53.4 |  |  | 2.9 |

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- References No definition available. + Details
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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 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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