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Fair Value Measurements (Tables)
 3 Months Ended
Apr. 01, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value Assets Measured on Recurring Basis
 
 
Fair Value Measurements on a Recurring Basis
As of First Quarter-End 2018
Description
 
Total
 
Level 1
 
Level 2
 
Level 3
 
 
(In millions of dollars)
Money market funds
 
$
4.3

 
$
4.3

 
$
—

 
$
—

Investment in Persol Holdings
 
265.2

 
265.2

 
—

 
—

 
 
 
 
 
 
 
 
 
Total assets at fair value
 
$
269.5

 
$
269.5

 
$
—

 
$
—

 
 
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

 
$
—

 
$
—