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Goodwill
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
The following table presents the changes in goodwill in 2024 and 2023 (in millions):
 Quant & Solutions
Goodwill$22.1 
Accumulated impairment(1.8)
December 31, 2022$20.3 
Additions— 
Impairments— 
Goodwill22.1 
Accumulated impairment(1.8)
December 31, 2023$20.3 
Additions— 
Impairments— 
Goodwill22.1 
Accumulated impairment(1.8)
December 31, 2024$20.3