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Intangible Assets, net

6 Months Ended

Jun. 30, 2021

Note 5. Intangible Assets, net

Intangible assets, net consisted of the following:


		June 30, 2021				December 31, 2020
	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	5.0	$	0.7	$	(0.5)	$	0.7	$	(0.5)
Customer lists/relationships	14.9		623.4		(415.2)		623.2		(396.7)
Software	10.0		8.1		(8.1)		8.1		(8.1)
Other	5.2		0.8		(0.6)		1.1		(0.9)
			633.0		(424.4)		633.1		(406.2)
Intangible assets not subject to amortization:
Trade names			720.3		—		720.2		—
		$	1,353.3	$	(424.4)	$	1,353.3	$	(406.2)

Amortization expense for intangible assets was $18.4 million and $20.9 million for the six months ended June 30, 2021 and 2020, respectively. Foreign currency translation gains related to intangible assets, net, were $0.2 million for the six months ended June 30, 2021 compared to foreign currency translation losses of $3.2 million for the same period in 2020.

In the six months ended June 30, 2020, we recognized impairment losses of $64.3 million on our trade names and $24.7 million on our customer lists/relationships intangible assets, mainly related to certain of our energy-related businesses. See Note 12—“Impairment and Restructuring Charges” for further discussion.

The following is a summary of estimated future amortization expense for the remaining six months of 2021 and each of the succeeding five years:


	(in millions)
2021 (remaining six months)	$	18.1
2022		35.9
2023		31.6
2024		28.1
2025		23.9
2026		14.4