Goodwill and Intangible Assets - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0	$ 16,400,000
Landmark
Finite-Lived Intangible Assets [Line Items]
Goodwill disposed of in sale	148,100,000	148,100,000
Intangible assets disposed of in sale	55,500,000
Increase in assets held for sale pertaining to divestiture		58,200,000
Thompson Siegel & Walmsley, LLC
Finite-Lived Intangible Assets [Line Items]
Goodwill disposed of in sale	13,700,000	13,700,000
Copper Rock
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 0	$ 16,400,000