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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 28, 2015
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Assets Measured on Recurring Basis
 
 
Fair Value Measurements on a Recurring Basis
As of Second Quarter-End 2015
Description
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In millions of dollars)
Money market funds
 
$
3.3

 
$
3.3

 
$
—

 
$
—

Available-for-sale investment
 
107.8

 
107.8

 
—

 
—

 
 
 
 
 
 
 
 
 
Total assets at fair value
 
$
111.1

 
$
111.1

 
$
—

 
$
—

 
 
Fair Value Measurements on a Recurring Basis
As of Year-End 2014
Description
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In millions of dollars)
Money market funds
 
$
3.3

 
$
3.3

 
$
—

 
$
—

Available-for-sale investment
 
97.9

 
97.9

 
—

 
—

 
 
 
 
 
 
 
 
 
Total assets at fair value
 
$
101.2

 
$
101.2

 
$
—

 
$
—