Intangible Assets, net

3 Months Ended

Mar. 31, 2017

5. Intangible Assets, net

Intangible assets, net consisted of the following:


		March 31, 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	4.8	$	1.1	$	(0.7)	$	1.1	$	(0.6)
Customer lists/relationships	14.6		737.3		(352.3)		736.7		(338.9)
Software	10.0		8.1		(8.1)		8.1		(8.1)
Other	5.2		6.3		(5.6)		6.3		(5.5)
			752.8		(366.7)		752.2		(353.1)
Intangible assets not subject to amortization:
Trade names			752.4		—		752.2		—
		$	1,505.2	$	(366.7)	$	1,504.4	$	(353.1)

We recognized amortization expense for intangible assets of $13.4 million and $13.6 million for the first quarter of 2017 and 2016, respectively. Foreign currency translation gains related to intangible assets, net, were $0.6 million during the first quarter of 2017.

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


	(in millions)
2017 (remaining nine months)	$	37.0
2018		46.0
2019		45.9
2020		45.9
2021		42.0
2022		33.9