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Business separation
 6 Months Ended
Jun. 30, 2016
Other Income and Expenses [Abstract]  
Business separation
Business separation
In connection with the Separation as further described in Note 1 and Note 2, the Company has incurred pre-tax separation costs as shown in the table below. These costs were primarily related to professional fees associated with separation activities within the finance, tax and legal functions.
 
Three Months Ended June 30,
 
Six Months Ended June 30,
In millions
2016
 
2015
 
2016
 
2015
Separation costs
$
4.7

 
$
4.8

 
$
11.1

 
$
6.3