Intangible Assets, net

9 Months Ended

Sep. 30, 2017

5. Intangible Assets, net

Intangible assets, net consisted of the following:


		September 30, 2017				December 31, 2016
	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	4.7	$	0.9	$	(0.5)	$	1.1	$	(0.6)
Customer lists/relationships	14.6		741.7		(379.9)		736.7		(338.9)
Software	10.0		8.1		(8.1)		8.1		(8.1)
Other	5.4		6.4		(5.8)		6.3		(5.5)
			757.1		(394.3)		752.2		(353.1)
Intangible assets not subject to amortization:
Trade names			754.0		—		752.2		—
		$	1,511.1	$	(394.3)	$	1,504.4	$	(353.1)

We recognized amortization expense for intangible assets of $38.9 million and $40.6 million for the nine months ended September 30, 2017 and 2016, respectively. Foreign currency translation gains related to intangible assets, net, were $4.4 million during the nine months ended September 30, 2017.

The following is a summary of estimated aggregate amortization expense for the remaining three months of 2017 and each of the succeeding five years:


	(in millions)
2017 (remaining three months)	$	11.6
2018		46.3
2019		46.2
2020		46.2
2021		42.2
2022		34.0