Fair Value Measurements (Tables)

6 Months Ended

Jun. 28, 2020

Fair Value Disclosures [Abstract]

Schedule of Fair Value Assets Measured on Recurring Basis

	As of Second Quarter-End 2020
Description	Total		Level 1		Level 2		Level 3
	(In millions of dollars)
Money market funds	$	121.5	$	121.5	$	—	$	—
Investment in Persol Holdings	127.2		127.2		—		—
Total assets at fair value	$	248.7	$	248.7	$	—	$	—

	As of Year-End 2019
Description	Total		Level 1		Level 2		Level 3
	(In millions of dollars)
Money market funds	$	4.9	$	4.9	$	—	$	—
Investment in Persol Holdings	173.2		173.2		—		—
Total assets at fair value	$	178.1	$	178.1	$	—	$	—