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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2017
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
 
2017
 
2016
 
2017
 
2016
Effective tax rate
 
(116.7
)%
 
45.6
%
 
(600.0
)%
 
48.5
%