Goodwill and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2012

Goodwill and Other Intangible Assets [Abstract]

Acquired intangible assets subject to amortization

Acquired intangible assets subject to amortization as of September 30, 2012 and December 31, 2011 were as follows:

	September 30, 2012				December 31, 2011
(millions of dollars)		Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Patents and trademarks	$	6.2	$	4.1	$	6.2	$	4.0
Customer lists		2.7		1.5		2.7		1.5
	$	8.9	$	5.6	$	8.9	$	5.5