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Stockholders' equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss)
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 (Loss)
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).
Changes in Common Stock and Treasury Stock
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