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Intangible Assets
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Intangible Assets
The gross carrying amount and accumulated amortization for intangible assets as of March 31, 2024 consisted of the following (in millions):
 March 31, 2024
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
Customer relationships$737.4 $220.5 $516.9 
Developed technology71.4 35.6 35.8 
Trade names47.9 7.2 40.7 
Acquired technology20.6 5.2 15.4 
Non-compete agreements2.9 2.9 — 
Patents1.9 0.9 1.0 
Total
$882.1 $272.3 $609.8 

The gross carrying amount and accumulated amortization for intangible assets as of December 31, 2023 consisted of the following (in millions):
 December 31, 2023
 Gross
Carrying
Amount		Accumulated
Amortization		Net
Carrying
Amount
Amortized Intangible Assets
Customer relationships$743.8 $209.4 $534.4 
Developed technology71.8 34.1 37.7 
Trade names32.7 6.4 26.3 
Acquired technology20.8 4.5 16.3 
Non-compete agreements2.9 2.8 0.1 
Patents1.9 0.9 1.0 
Total(1)
$873.9 $258.1 $615.8 
Unamortized Intangible Assets
Trade names(2)
$15.5 $— $15.5 
(1) Includes $0.7 million intangible asset impairment for the year ended 2023.
(2) Amortization of certain trade names began effective January 1, 2024 to reflect current expectations for the period over which the assets will contribute to future cash flows.
Amortization expense of intangible assets was $15.8 million and $14.5 million for the three months ended March 31, 2024 and 2023, respectively. Intangibles are expensed using the straight-line amortization method.