Intangible Assets, net

6 Months Ended

Jun. 30, 2015

5. Intangible Assets, net

Intangible assets, net consisted of the following:

		June 30, 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	$	1.4	$	(0.9	)	$	2.3	$	(1.7	)
Customer lists/relationships	14.2	690.9		(273.7		)	694.7		(249.3		)
Software – internal use	10.0	8.1		(7.5		)	8.1		(7.1		)
Other	5.4	6.4		(4.4		)	7.2		(4.5		)

		706.8		(286.5		)	712.3		(262.6		)
Intangible assets not subject to amortization:
Trade names		775.6		—			777.7		—

		$	1,482.4	$	(286.5	)	$	1,490.0	$	(262.6	)

We recognized amortization expense for intangible assets of $27.7 million and $28.2 million for the six months ended June 30, 2015 and 2014, respectively. Other changes in intangible assets, net during the six months ended June 30, 2015 are mainly due to foreign currency translation losses of $4.7 million.

The following is a summary of estimated aggregate amortization expense for the remaining six months of 2015 and each of the succeeding five years:

	(in millions)
2015	$	26.7
2016	52.0
2017	47.7
2018	43.4
2019	43.3
2020	43.3