Fair Value Measurements (Tables)

12 Months Ended

Jan. 01, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements on a Recurring Basis

The following tables present the assets carried at fair value as of year-end 2016 and 2015 on 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 2016
Description	Total		Level 1		Level 2		Level 3
	(In millions of dollars)
Money market funds	$	4.0	$	4.0	$	—	$	—
Available-for-sale investment	141.2		141.2		—		—
Total assets at fair value	$	145.2	$	145.2	$	—	$	—

	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	$	—	$	—