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Intangible Assets
 12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
At December 31, 2022, the Company had $652.5 million of intangible assets in the ATM segment and $57.8 million in the FBS segment. At December 31, 2021, all of our intangible assets were in the ATM segment. The gross carrying amount and accumulated amortization for intangible assets consisted of the following (in millions):
 December 31, 2022
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
Customer relationships$754.8 $159.4 $595.4 
Developed technology71.2 26.5 44.7 
Trade names35.8 4.4 31.4 
Acquired technology23.5 1.6 21.9 
Non-compete agreements2.9 2.7 0.2 
Patents1.9 0.7 1.2 
Total$890.1 $195.3 $694.8 
Unamortized Intangible Assets
Trade names(1)
$15.5 $— $15.5 
(1) During the first quarter of 2022, indefinite-lived trade names and developed technology with net carrying amounts of $4.2 million and $0.5 million were allocated to the disposal group classified as held for sale and subsequently impaired.

 December 31, 2021
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
Customer relationships$541.7 $119.2 $422.5 
Developed technology74.6 20.7 53.9 
Trade names18.9 2.7 16.2 
Non-compete agreements2.9 2.5 0.4 
Patents1.5 0.6 0.9 
Total$639.6 $145.7 $493.9 
Unamortized Intangible Assets
Trade names$20.0 $— $20.0 

Amortization expense of intangible assets was $53.4 million, $39.7 million and $24.6 million for the years ended December 31, 2022, 2021 and 2020, respectively. Finite-lived intangibles in the ATM segment are expensed using the straight-line amortization method.
The following table shows the estimated aggregate amortization expense as of December 31, 2022 (in millions):

2023$63.5 
202463.2 
202562.4 
202662.4 
202762.4