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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]  
Effective Tax Rate
The effective tax rate is as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
In millions
 
2016
 
2015
 
2016
 
2015
Effective tax rate
 
45.6
%
 
29.1
%
 
48.5
%
 
(51.4
)%