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Intangible Assets, Goodwill and Other
9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure Goodwill and Intangibles
Changes in the carrying amounts of goodwill and intangible assets are as follows:
GoodwillIntangiblesTotal
Balance as of December 31, 2023
$35.1 $6.4 $41.5 
Recognized goodwill12.3 — 12.3 
  Amortization— (1.6)(1.6)
Balance as of September 30, 2024
$47.3 $4.8 $52.2 
Intangible assets consisted of $4.8 million customer relationships. Outstanding definite-lived intangible assets are amortized over their useful lives of 10 years.
The gross book value and accumulated amortization of definite lived intangible assets at September 30, 2024 was $34.9 million and $30.0 million. The gross book value and accumulated amortization of definite lived intangible assets at December 31, 2023 was $34.9 million and $28.4 million.