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Fair Value Measurements (Tables)
12 Months Ended
Dec. 30, 2018
Fair Value Disclosures [Abstract]  
Fair Value Measurements on a Recurring Basis
The following tables present assets measured at fair value on a recurring basis as of year-end 2018 and 2017 in the consolidated balance sheet by fair value hierarchy level, as described below. 
Level 1 measurements consist of unadjusted quoted prices in active markets for identical assets or liabilities.  Level 2 measurements include quoted prices in markets that are not active or model inputs that are observable either directly or indirectly for substantially the full term of the asset or liability. Level 3 measurements include significant unobservable inputs. 
 
 
Fair Value Measurements on a Recurring Basis
As of Year-End 2018
Description
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In millions of dollars)
Money market funds
 
$
4.6

 
$
4.6

 
$

 
$

Investment in Persol Holdings
 
135.1

 
135.1

 

 

 
 
 
 
 
 
 
 
 
Total assets at fair value
 
$
139.7

 
$
139.7

 
$

 
$

 
 
Fair Value Measurements on a Recurring Basis
As of Year-End 2017
Description
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In millions of dollars)
Money market funds
 
$
4.3

 
$
4.3

 
$

 
$

Investment in Persol Holdings
 
228.1

 
228.1

 

 

 
 
 
 
 
 
 
 
 
Total assets at fair value
 
$
232.4

 
$
232.4

 
$

 
$