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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 28, 2014
Accounting Policies [Abstract]  
Property and Equipment At Cost and Depreciable Useful Lives
Cost and estimated useful lives of property and equipment by function are as follows:
 
Category
 
2014
 
2013
 
Life
 
 
(In millions of dollars)
 
 
 
 
Land
 
$
3.8

 
$
3.8

 
 
—
 
Work in process
 
6.9

 
4.4

 
 
—
 
Buildings and improvements
 
59.7

 
58.9

 
15
to
45 years
Computer hardware and software
 
221.7

 
215.7

 
3
to
12 years
Equipment, furniture and fixtures
 
34.1

 
33.6

 
 
5
years 
Leasehold improvements
 
33.8

 
34.1

 
The lesser of the life of the lease or 5 years.
Total property and equipment
 
$
360.0

 
$
350.5