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Intangible Assets, net | 12 Months Ended
--- | ---
Dec. 31, 2019
Intangible Assets, net |
Intangible Assets, net | Note 7. Intangible Assets, net ​ Intangible assets, net, consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | December 31, 2019 | ​ | December 31, 2018
​ | 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 | ​ | $ | (0.4) | ​ | $ | 0.8 | ​ | $ | (0.4)
Customer lists/relationships | 15.0 | ​ | ​ | 710.1 | ​ | ​ | (438.1) | ​ | ​ | 707.3 | ​ | ​ | (393.4)
Software | 10.0 | ​ | ​ | 8.1 | ​ | ​ | (8.1) | ​ | ​ | 8.1 | ​ | ​ | (8.1)
Other | 7.6 | ​ | ​ | 1.1 | ​ | ​ | (0.9) | ​ | ​ | 1.0 | ​ | ​ | (0.9)
​ | ​ | ​ | ​ | 720.0 | ​ | ​ | (447.5) | ​ | ​ | 717.2 | ​ | ​ | (402.8)
Intangible assets not subject to amortization: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Trade names | ​ | ​ | ​ | 758.6 | ​ | ​ | — | ​ | ​ | 757.6 | ​ | ​ | —
​ | ​ | ​ | $ | 1,478.6 | ​ | $ | (447.5) | ​ | $ | 1,474.8 | ​ | $ | (402.8)
​ During 2018, we recognized impairment losses of $16.5 million and $16.7 million on our trade name and customer relationship intangible assets, respectively, related to one of our energy businesses. See Note 19 — “Impairment and Restructuring Charges” for further discussion of our impairment losses. ​ Amortization expense for intangible assets amounted to $43.1 million, $45.8 million and $50.6 million in 2019, 2018 and 2017, respectively. Foreign currency translation gains related to intangible assets, net in 2019 were $2.2 million. ​ The following is a summary of estimated aggregate amortization expense for each of the next five years: ​
​ | ​ | ​
​ | (in millions)
2020 | $ | 43.2
2021 | ​ | 41.5
2022 | ​ | 36.7
2023 | ​ | 30.7
2024 | ​ | 27.2
​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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