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Goodwill and Other Intangible Assets, Net
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets, Net Goodwill and Other Intangible Assets, Net
The carrying amount of goodwill was $51.7 million at both September 30, 2024 and December 31, 2023.
The gross carrying amount, accumulated amortization and net book value of intangible assets at the end of each period were as follows:
September 30, 2024December 31, 2023
(in millions)
Gross
Carrying Amount		Accumulated AmortizationNet
Book Value		Gross
Carrying Amount		Accumulated AmortizationNet
Book Value
Customer relationships$43.2 $(32.9)$10.3 $43.2 $(30.9)$12.3 
Internal-use software51.0 (15.1)35.9 43.1 (13.9)29.2 
Developed technology27.4 (4.4)23.0 27.4 (3.0)24.4 
Patents36.2 (5.8)30.4 36.2 (3.4)32.8 
Total intangible assets$157.8 $(58.2)$99.6 $149.9 $(51.2)$98.7 
Amortization expense for intangible assets was $2.5 million and $2.6 million for the three months ended September 30, 2024 and 2023, respectively, and was $7.3 million and $7.7 million for the nine months ended September 30, 2024 and 2023, respectively.