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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2021 is as follows:
In millionsFreight SegmentTransit SegmentTotal
Balance at December 31, 2020$6,872.2 $1,613.0 $8,485.2 
Additions / opening balance sheet adjustments214.2 — 214.2 
Foreign currency impact2.8 (49.0)(46.2)
Balance at June 30, 2021$7,089.2 $1,564.0 $8,653.2 
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,
2021		December 31,
2020
Intellectual property, patents, and other intangibles, net of accumulated amortization of $274.9 and $223.7
$1,015.6 $1,007.6 
Backlog, net of accumulated amortization of $259.2 and $206.9
1,173.0 1,224.7 
Customer relationships, net of accumulated amortization of $306.4 and $276.3
1,026.8 986.2 
Total$3,215.4 $3,218.5 
Amortization Expense Amortization expense for the five succeeding years is estimated to be as follows:
In millions
Remainder of 2021$145.5 
2022290.3 
2023289.6 
2024280.1 
2025277.5