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Income taxes
9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]  
Income taxes
Income taxes

Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Continuing operations
 
 
 
 
 
 
 
Provision for income taxes (in millions)
$
14.1

 
26.8

 
37.2

 
39.6

Effective tax rate
65.9
%
 
48.7
%
 
341.3
%
 
(187.7
%)


2015 Compared to U.S. Statutory Rate
The effective income tax rate on continuing operations in the first nine months of 2015 was greater than the 35% U.S. statutory tax rate primarily due to the significant nondeductible expenses resulting from the currency devaluation in Venezuela in the first quarter and from the Venezuela impairment recorded in the second quarter. 
Excluding these nondeductible expenses, our effective tax rate on continuing operations in the first nine months is 48%.  The rate is higher than 35% primarily due to cross border payments, nondeductible expenses in Mexico and the characterization of a French business tax as an income tax, partially offset by the geographical mix of earnings.

2014 Compared to U.S. Statutory Rate
The effective income tax rate on continuing operations in the first nine months of 2014 was negative and less than the 35% U.S. statutory tax rate primarily due to the significant nondeductible expenses resulting from the currency devaluation in Venezuela in the first quarter.  These nondeductible expenses caused our earnings before tax in the period to be negative. 

Excluding the Venezuela nondeductible expenses, our effective tax rate on continuing operations in the first nine months was 42%. The rate was higher than 35% primarily due to third-quarter tax expense for a divestiture of an equity-method investment in Peru, combined with higher tax expense resulting from cross border payments, nondeductible expenses in Mexico and the characterization of a French business tax as an income tax, partially offset by lower taxes resulting from the geographical mix of earnings.