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Intangibles (Tables)
6 Months Ended
Jun. 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 six months ended June 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) 
Foreign currency impact(36.8) (10.4) (47.2) 
Balance at June 30, 2020$6,836.3  $1,473.6  $8,309.9  
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 millionsJune 30,
2020
December 31,
2019
Intellectual property, patents, and other intangibles, net of accumulated amortization of $173.1 and $123.8
$1,058.4  $1,108.9  
Backlog, net of accumulated amortization of $149.2 and $92.0
1,277.4  1,342.1  
Customer relationships, net of accumulated amortization of $236.5 and $212.9
985.3  1,029.9  
Total$3,321.1  $3,480.9  
Amortization Expense
Amortization expense for the five succeeding years is estimated to be as follows:
In millions
Remainder of 2020$139.8  
2021277.7  
2022277.1  
2023276.7  
2024267.2