Intangible Assets, net

6 Months Ended

Jun. 30, 2017

Intangible Assets, net

Intangible Assets, net

5.  Intangible Assets, net

Intangible assets, net consisted of the following:

		June 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	4.8	$	1.1	$	(0.7)	$	1.1	$	(0.6)
Customer lists/relationships	14.6		739.0		(366.5)		736.7		(338.9)
Software	10.0		8.1		(8.1)		8.1		(8.1)
Other	5.3		6.5		(5.8)		6.3		(5.5)
			754.7		(381.1)		752.2		(353.1)
Intangible assets not subject to amortization:
Trade names			753.1		—		752.2		—
		$	1,507.8	$	(381.1)	$	1,504.4	$	(353.1)

We recognized amortization expense for intangible assets of $26.7 million and $27.1 million for the six months ended June 30, 2017 and 2016, respectively. Foreign currency translation gains related to intangible assets, net, were $2.1 million during the six months ended June 30, 2017.

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

	(in millions)
2017 (remaining six months)	$	23.7
2018		46.2
2019		46.0
2020		46.0
2021		42.1
2022		33.9