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Goodwill and Intangibles
3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangibles Goodwill and Intangibles
The following table provides information related to the goodwill and intangible assets as of March 31, 2024 and December 31, 2023 (in millions):
March 31,December 31,
20242023
Goodwill$40.0 $40.0 
Definite-lived intangibles27.8 28.6 
Indefinite-lived intangibles0.7 0.7 
Balance$68.5 $69.3 

The following table summarizes information related to the Company's definite-lived intangible assets as of March 31, 2024 (in millions):

Amortization
Period
 (Years)
Gross Carrying
Amount
Accumulated
Amortization
Net Book ValueWeighted Average Useful Life
Client lists
10 yrs
$26.1 $3.9 $22.2 9.1
Trademarks
10 yrs
6.2 0.6 5.6 9.1
Total $32.3 $4.5 $27.8 9.1


The following table summarizes information related to the Company's definite-lived intangible assets as of December 31, 2023 (in millions):
Amortization
Period
 (Years)
Gross Carrying
Amount
Accumulated
Amortization
Net Book ValueWeighted Average Useful Life
Client lists
10 yrs
$26.1 $3.3 $22.8 9.3
Trademarks
10 yrs
6.2 0.4 5.8 9.4
Total $32.3 $3.7 $28.6 9.3


In the first quarter of 2024, the Company recorded $0.8 million of intangible amortization expense, of which $0.7 million related to the prior year's acquisition of Indoff. The estimated amortization for future years ending December 31 is as follows (in millions):

2024 remainder$2.4 
20253.0 
20263.0 
20273.0 
20283.0 
Thereafter$13.4 
Total$27.8