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Income Taxes (Tables)
6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Effective Tax Rate
The effective tax rate is as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
In millions
 
2018
 
2017
 
2018
 
2017
Effective tax rate
 
33.3
%
 
(33.3
)%
 
(50.0
)%
 
(20.0
)%