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Business Combinations, Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Goodwill activity was as follows for each period presented (in millions of dollars):
| December 31, 2018 |  | Add: Impairment of IMT Goodwill |  | December 31, 2019
Goodwill | $ | 62.4 |  |  | $ | — |  |  | $ | 62.4 |
Accumulated impairment loss | (18.4 | ) |  | (25.2 | ) |  | (43.6 | )
Carrying value | $ | 44.0 |  |  | $ | (25.2 | ) |  | $ | 18.8 |
| December 31, 2017 |  | Add: Goodwill from IMT Acquisition |  | December 31, 2018
Goodwill | $ | 37.2 |  |  | $ | 25.2 |  |  | $ | 62.4 |
Accumulated impairment loss | (18.4 | ) |  | — |  |  | (18.4 | )
Carrying value | $ | 18.8 |  |  | $ | 25.2 |  |  | $ | 44.0 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | Intangible Assets. Information regarding our intangible assets consisted of the following as of the periods presented (in millions of dollars, except amortization periods):
|  | Weighted-Average Amortization Period (in years) |  | Gross Amount |  | Accumulated Amortization |  | Intangible Assets, Net
December 31, 2019 |  |  |  |  |  |  |  |
Customer relationships |  | 24 |  | $ | 36.1 |  |  | $ | (12.7 | ) |  | $ | 23.4 |
Trade name |  | 10 |  | 2.4 |  |  | (0.3 | ) |  | 2.1 |
Non-compete agreement |  | 5 |  | 5.4 |  |  | (1.3 | ) |  | 4.1 |
Total |  |  |  | $ | 43.9 |  |  | $ | (14.3 | ) |  | $ | 29.6 |
December 31, 2018 |  |  |  |  |  |  |  |
Customer relationships |  | 24 |  | $ | 36.1 |  |  | $ | (11.1 | ) |  | $ | 25.0 |
Trade name |  | 10 |  | 2.4 |  |  | (0.1 | ) |  | 2.3 |
Non-compete agreement |  | 5 |  | 5.4 |  |  | (0.3 | ) |  | 5.1 |
Total |  |  |  | $ | 43.9 |  |  | $ | (11.5 | ) |  | $ | 32.4 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | Amortization expense relating to definite-lived intangible assets was $2.8 million for 2019, $1.8 million for 2018, and $1.4 million for 2017. The expected amortization of intangible assets for each of the next five calendar years is as follows (in millions of dollars):
2020 | $ | 2.8 |
2021 | 2.8 |
2022 | 2.8 |
2023 | 2.6 |
2024 | 1.8 |
Thereafter | 16.8 |
Total | $ | 29.6 |

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