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Business Combinations, Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Business Combinations Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The following table presents the changes in the carrying value of our goodwill (in millions of dollars):
|  | As of December 31, |
|  | 2020 |  |  | 2019 |
Gross carrying value |  | $ | 37.2 |  |  | $ | 62.4 |
Accumulated impairment loss: |  |  |  |  |  |  |  |
Beginning balance |  |  | (18.4 | ) |  |  | (18.4 | )
Impairment loss |  |  | — |  |  |  | (25.2 | )
Ending balance |  |  | (18.4 | ) |  |  | (43.6 | )
Net carrying value |  | $ | 18.8 |  |  | $ | 18.8 |
Schedule of Gross Carrying Amount and Accumulated Amortization By Major Intangible Asset Class | The following table presents the gross carrying amount and accumulated amortization by major intangible asset class (in millions of dollars, except amortization periods):
|  | Weighted- Average Amortization Period (in years) |  |  | Gross Amount |  |  | Accumulated Amortization |  |  | Intangible Assets, Net |
As of December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customer relationships |  |  | 24 |  |  | $ | 36.1 |  |  | $ | (14.2 | ) |  | $ | 21.9 |
Trade name |  |  | 10 |  |  |  | 2.4 |  |  |  | (0.6 | ) |  |  | 1.8 |
Non-compete agreement |  |  | 5 |  |  |  | 5.4 |  |  |  | (2.4 | ) |  |  | 3.0 |
Total |  |  |  |  |  | $ | 43.9 |  |  | $ | (17.2 | ) |  | $ | 26.7 |
As of 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 |
Schedule of Expected Amortization of Intangible Assets | The following table presents the expected amortization of intangible assets for each of the next five calendar years and thereafter as of December 31, 2020 (in millions of dollars):
2021 |  | $ | 2.8 |
2022 |  |  | 2.8 |
2023 |  |  | 2.6 |
2024 |  |  | 1.8 |
2025 |  |  | 1.8 |
Thereafter |  |  | 14.9 |
Total |  | $ | 26.7 |

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