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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2021
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 nine months ended September 30, 2021 is as follows:
In millions | Freight Segment |  | Transit Segment |  | Total
Balance at December 31, 2020 | $ | 6,872.2 |  |  | $ | 1,613.0 |  |  | $ | 8,485.2 |
Additions | 214.1 |  |  | — |  |  | 214.1 |
Foreign currency impact | (9.3) |  |  | (85.3) |  |  | (94.6) |
Balance at September 30, 2021 | $ | 7,077.0 |  |  | $ | 1,527.7 |  |  | $ | 8,604.7 |
Intangible Assets of the Company, Other Than Goodwill and Trade Names | Intangible assets of the Company, other than goodwill and trade names, consist of the following:
In millions | September 30, 2021 |  | December 31, 2020
Intellectual property, patents, and other intangibles, net of accumulated amortization of $301.1 and $223.7 | $ | 988.6 |  |  | $ | 1,007.6 |
Backlog, net of accumulated amortization of $285.5 and $206.9 | 1,142.7 |  |  | 1,224.7 |
Customer relationships, net of accumulated amortization of $319.3 and $276.3 | 1,001.6 |  |  | 986.2 |
Total | $ | 3,132.9 |  |  | $ | 3,218.5 |
Amortization Expense | Amortization expense for the five succeeding years is estimated to be as follows:
In millions |
Remainder of 2021 | $ | 72.9 |
2022 | 290.2 |
2023 | 289.5 |
2024 | 280.0 |
2025 | 277.4 |
2026 | 273.6 |

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