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Stockholders' equity
 12 Months Ended
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