Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Other Intangible Assets [Abstract]

Carrying amount of goodwill by reportable segment

The balance of goodwill by segment and the activity occurring in the past two fiscal years is as follows:

	Specialty Minerals			Refractories			Performance Materials			Construction Technologies			Consolidated
	(millions of dollars)
Balance at December 31, 2013	$	14.3		$	50.1		$	-		$	-		$	64.4
Change in goodwill relating to:
Acquisition								453.2			255.0			708.2
Foreign exchange translation		(0.6	)		(1.1	)		-			-			(1.7	)
Total Changes	$	(0.6	)	$	(1.1	)	$	453.2		$	255.0		$	706.5
Balance at December 31, 2014	$	13.7		$	49.0		$	453.2		$	255.0		$	770.9
Change in goodwill relating to:
Purchase price finalization		-			-			91.1			(78.3	)		12.8
Foreign exchange translation		(0.4	)		(2.0	)		(0.1	)		-			(2.5	)
Total Changes		(0.4	)		(2.0	)		91.0			(78.3	)		10.3
Balance at December 31, 2015	$	13.3		$	47.0		$	544.2		$	176.7		$	781.2

Acquired intangible assets subject to amortization

Acquired intangible assets subject to amortization as of December 31, 2015 and December 31, 2014 were as follows:

			December 31, 2015				December 31, 2014
	Weighted Average Useful Life (Years)
			Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
			(millions of dollars)
Tradenames		34	$	199.8	$	9.3	$	191.2	$	3.7
Technology		12		18.8		2.5		18.7		1.0
Patents and trademarks		17		6.4		4.4		6.4		4.0
Customer relationships		30		4.5		0.6		4.4		0.1
Customer lists		15		2.9		2.9		2.9		2.7
		28	$	232.4	$	19.7	$	223.6	$	11.5