Fair Value Measurements (Tables)

6 Months Ended

Jul. 03, 2016

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 2016
Description	Total		Level 1		Level 2		Level 3
	(In millions of dollars)
Money market funds	$	3.9	$	3.9	$	—	$	—
Available-for-sale investment	156.5		156.5		—		—
Total assets at fair value	$	160.4	$	160.4	$	—	$	—

	Fair Value Measurements on a Recurring Basis As of Year-End 2015
Description	Total		Level 1		Level 2		Level 3
	(In millions of dollars)
Money market funds	$	3.7	$	3.7	$	—	$	—
Available-for-sale investment	142.3		142.3		—		—
Total assets at fair value	$	146.0	$	146.0	$	—	$	—