Intangible Assets and Goodwill

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

7. Intangible Assets and Goodwill

The following tables present certain information regarding our intangible assets. Amortizable intangible assets are being amortized on a straight-line basis over their estimated useful lives of ten years with no estimated residual values, which materially approximates the expected pattern of use.

	June 30, 2019			September 30, 2018
		(in millions)
Trademarks	$	17.2		$	17.6
Customer relationships		14.7			15.1
		31.9			32.7
Less: accumulated amortization		(28.7	)		(27.0	)
	$	3.2		$	5.7

Aggregate intangible asset amortization expense amounted to $0.8 million and $0.9 million for the three months ended June 30, 2019 and 2018, respectively, and $1.6 million and $1.7 million for the six months ended June 30, 2019 and 2018, respectively.

The estimated intangible asset amortization expense for the years ending December 31 are as follows:

Year ending December 31, (in millions)
2019 (six months)	$	1.6
2020		1.6
Total	$	3.2

Goodwill

The difference in the carrying amount of goodwill at June 30, 2019 and September 30, 2018 (amounting to $1.1 million), as reported in the accompanying unaudited interim condensed consolidated balance sheets, is attributable to foreign currency translation adjustments.