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INTANGIBLES (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Change in the Carrying Amount of Goodwill by Segment | The change in the carrying amount of goodwill by segment for the year ended December 31, 2020 is as follows:
|  | Freight |  | Transit |  |
In millions |  | Segment |  | Segment |  | Total
Balance at December 31, 2019 |  | $ | 6,876.6 |  |  | $ | 1,484.0 |  |  | $ | 8,360.6 |
Additions |  | 2.1 |  |  | — |  |  | 2.1 |
Disposals |  | (5.6) |  |  | — |  |  | (5.6) |
Foreign currency impact |  | (0.9) |  |  | 129.0 |  |  | 128.1 |
Balance at December 31, 2020 |  | $ | 6,872.2 |  |  | $ | 1,613.0 |  |  | $ | 8,485.2 |
Intangible Assets of the Company, Other Than Goodwill and Trademarks | Intangible assets of the Company, other than goodwill and trade names, consist of the following:
|  | December 31,
In millions |  | 2020 |  | 2019
Intellectual property, patents, and other intangibles, net of accumulated amortization of $222.8 and $123.8 |  | $ | 1,007.6 |  |  | $ | 1,108.9 |
Backlog, net of accumulated amortization of $205.9 and $92.0 |  | 1,224.7 |  |  | 1,342.1 |
Customer relationships, net of accumulated amortization of $276.3 and $212.9 |  | 986.2 |  |  | 1,029.9 |
Total |  | $ | 3,218.5 |  |  | $ | 3,480.9 |
Estimated Amortization Expense Five Succeeding Years | Estimated amortization expense for the five succeeding years is as follows (in millions):
2021 |  | $ | 278.1 |
2022 |  | 277.6 |
2023 |  | 277.2 |
2024 |  | 267.6 |
2025 |  | 265.0 |

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