Fair Value Measurements (Tables)

3 Months Ended

Mar. 29, 2015

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 2015
Description	Total		Level 1		Level 2		Level 3
	(In millions of dollars)
Money market funds	$	3.3	$	3.3	$	—	$	—
Available-for-sale investment	102.9		102.9		—		—
Total assets at fair value	$	106.2	$	106.2	$	—	$	—

	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	$	—	$	—