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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2015
Income Tax Disclosure [Abstract]  
Effective Tax Rate
The effective tax rate for the three and six months ended June 30, 2015 and June 30, 2014 were as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
In millions
 
2015
 
2014
 
2015
 
2014
Effective tax rate
 
(6.4
)%
 
27.3
%
 
(11.0
)%
 
27.6
%