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Intangibles (Tables)
9 Months Ended
Sep. 30, 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 nine months ended September 30, 2020 is as follows:
In millionsFreight SegmentTransit SegmentTotal
Balance at December 31, 2019$6,876.6 $1,484.0 $8,360.6 
Additions / opening balance sheet adjustments(3.5)— (3.5)
Disposals(5.6)— (5.6)
Foreign currency impact(29.9)44.5 14.6 
Balance at September 30, 2020$6,837.6 $1,528.5 $8,366.1 
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 millionsSeptember 30,
2020
December 31,
2019
Intellectual property, patents, and other intangibles, net of accumulated amortization of $198.2 and $123.8
$1,032.3 $1,108.9 
Backlog, net of accumulated amortization of $177.7 and $92.0
1,248.5 1,342.1 
Customer relationships, net of accumulated amortization of $254.2 and $212.9
981.2 1,029.9 
Total$3,262.0 $3,480.9 
Amortization Expense
Amortization expense for the five succeeding years is estimated to be as follows:
In millions
Remainder of 2020$69.5 
2021277.7 
2022277.1 
2023276.7 
2024267.2