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Intangible Assets | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The gross carrying amount and accumulated amortization for intangible assets which are in our AMS segment consisted of the following ($ in millions):
| March 31, 2021
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairments |  | Accumulated Foreign Exchange |  | Net Carrying Amount
Amortized Intangible Assets
Customer relationships | $ | 339.2 |  |  | $ | 94.1 |  |  | $ | — |  |  | $ | (1.1) |  |  | $ | 246.2 |
Developed technology | 42.0 |  |  | 14.9 |  |  | — |  |  | 0.1 |  |  | 27.0 |
Trade names | 32.7 |  |  | 1.6 |  |  | 20.7 |  |  | 0.3 |  |  | 10.1 |
Non-compete agreements | 2.9 |  |  | 2.4 |  |  | — |  |  | — |  |  | 0.5 |
Patents | 1.5 |  |  | 0.6 |  |  | — |  |  | — |  |  | 0.9 |
Total | $ | 418.3 |  |  | $ | 113.6 |  |  | $ | 20.7 |  |  | $ | (0.7) |  |  | $ | 284.7 |
Unamortized Intangible Assets
Trade names | $ | 20.0 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | (0.2) |  |  | $ | 20.1 |
| December 31, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Accumulated Impairments |  | Accumulated Foreign Exchange |  | Net Carrying Amount
Amortized Intangible Assets
Customer relationships | $ | 339.8 |  |  | $ | 88.5 |  |  | $ | — |  |  | $ | (2.9) |  |  | $ | 254.2 |
Developed technology | 42.1 |  |  | 14.1 |  |  | — |  |  | (0.2) |  |  | 28.2 |
Trade names | 32.7 |  |  | 1.4 |  |  | 20.7 |  |  | 0.3 |  |  | 10.3 |
Non-compete agreements | 2.9 |  |  | 2.4 |  |  | — |  |  | — |  |  | 0.5 |
Patents | 1.5 |  |  | 0.5 |  |  | — |  |  | — |  |  | 1.0 |
Total | $ | 419.0 |  |  | $ | 106.9 |  |  | $ | 20.7 |  |  | $ | (2.8) |  |  | $ | 294.2 |
Unamortized Intangible Assets
Trade names | $ | 20.0 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | (0.6) |  |  | $ | 20.5 |
Amortization expense of intangible assets was $6.5 million and $5.3 million for the three months ended March 31, 2021 and 2020, respectively. Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method. The estimated average aggregate amortization expense is $24.8 million in each of the next five years.

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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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