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Restructuring Charges (Tables)
 3 Months Ended
Apr. 03, 2016
Restructuring Charges [Abstract]  
Reconciliation of restructuring liability
The following table is a reconciliation of our restructuring liability balance as of April 3, 2016:

  
(millions of dollars)
 
Restructuring liability, December 31, 2015
 
$
7.9
 
Additional provisions
  
0.9
 
Cash payments
  
(2.7
)
Restructuring liability,  April 3, 2016
 
$
6.1