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Intangible Assets
 3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The gross carrying amount and accumulated amortization for intangible assets which are in our AMS segment consisted of the following ($ in millions):
 March 31, 2022
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
Customer relationships$539.8 $127.5 $412.3 
Developed technology(1)
72.0 20.7 51.3 
Trade names18.8 3.0 15.8 
Non-compete agreements2.9 2.6 0.3 
Patents1.9 0.6 1.3 
Total$635.4 $154.4 $481.0 
Unamortized Intangible Assets
Trade names(1)
$15.7 $— $15.7 

(1) Intangible assets with a net carrying amount of $4.7 million are included as part of the disposal group classified as held for sale at March 31, 2022.
 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 $11.1 million and $6.5 million for the three months ended March 31, 2022 and 2021, respectively. Finite-lived intangibles in the AMS segment are expensed using the straight-line amortization method. The estimated average aggregate amortization expense is $43.6 million in each of the next five years.