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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 Intangible assets originated from the Company’s reorganization and application of fresh start accounting as of the date the Company emerged from bankruptcy, September 30, 2014, and reflect the conditions at that time. The intangible asset related to the sales order book is amortized as the order book existing at emergence is reduced, principally as a result of deliveries to customers. The intangible asset related to customer relationships is amortized using the straight-line method over the estimated average useful life of 15 years. Amortization expense is presented below gross profit on the unaudited condensed consolidated statements of operations and comprehensive income. Intangible asset balances are as follows (in millions):
| March 31, 2021 |  | December 31, 2020
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Amount
Sales order book | $ | 54.6 |  |  | $ | 33.0 |  |  | $ | 21.6 |  |  | $ | 54.6 |  |  | $ | 32.0 |  |  | $ | 22.6 |
Customer relationships | 68.9 |  |  | 29.8 |  |  | 39.1 |  |  | 68.9 |  |  | 28.7 |  |  | 40.2 |
Total | $ | 123.5 |  |  | $ | 62.8 |  |  | $ | 60.7 |  |  | $ | 123.5 |  |  | $ | 60.7 |  |  | $ | 62.8 |

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- Definition The entire disclosure for goodwill and 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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