Intangible Assets, net

12 Months Ended

Dec. 31, 2015

Note 6. Intangible Assets, net

Intangible assets, net, consisted of the following:


		December 31, 2015				December 31, 2014
	Weighted Average	Gross				Gross
	Amortizable	Carrying		Accumulated		Carrying		Accumulated
	Life in Years	Amount		Amortization		Amount		Amortization
		(in millions)
Intangible assets subject to amortization:
Covenants not to compete	4.4	$	1.3	$	(1.0)	$	2.3	$	(1.7)
Customer lists/relationships	14.7		659.0		(285.7)		694.7		(249.3)
Software – internal use	10.0		8.1		(7.9)		8.1		(7.1)
Other	5.3		6.3		(5.0)		7.2		(4.5)
			674.7		(299.6)		712.3		(262.6)
Intangible assets not subject to amortization:
Trade names			750.3		—		777.7		—
		$	1,425.0	$	(299.6)	$	1,490.0	$	(262.6)

Foreign currency translation losses related to intangible assets, net in 2015 were approximately $13.5 million. Impairment losses of $21.2 million related to five of our trade names and $14.4 million related to two of our customer relationships were recognized during the year ended December 31, 2015. See “Note 18 - Impairment of Long-Lived Assets” for further discussion of our impairment losses. No impairment losses were recognized during the year ended December 31, 2014.

Amortization expense for intangible assets amounted to $53.7 million, $56.7 million and $54.9 million in 2015, 2014 and 2013, respectively.

The following is a summary of estimated aggregate amortization expense for each of the next five years:


	(in millions)
2016	$	49.3
2017		45.1
2018		40.8
2019		40.6
2020		40.7