Goodwill and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill and Other Intangible Assets [Abstract]

Intangible Assets Subject to Amortization

Intangible assets subject to amortization as of March 31, 2019 and December 31, 2018 were as follows:

			Mar. 31, 2019				Dec. 31, 2018
(millions of dollars)	Weighted Average Useful Life (Years)		Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Tradenames		35	$	204.2	$	28.1	$	204.2	$	26.6
Technology		13		18.8		6.8		18.8		6.4
Patents		19		6.4		5.7		6.4		5.6
Customer relationships		22		26.5		3.5		26.5		3.2
		32	$	255.9	$	44.1	$	255.9	$	41.8