Redeemable Noncontrolling Interest - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
	Aug. 31, 2026	Sep. 30, 2026	Sep. 30, 2026	Dec. 31, 2025
Noncontrolling Interest [Line Items]
Distributions paid		$ 20.9	$ 62.5
Class A Common Stock
Noncontrolling Interest [Line Items]
Shares issued on exchange of units (in shares)			5,029,125
Common stock, shares, outstanding (in shares)		18,642,410	18,642,410	12,650,000
Common stock, shares, issued (in shares)		18,642,410	18,642,410	12,650,000
Class X Umbrella Units | Anderson Group Inc | AT Umbrella LLC
Noncontrolling Interest [Line Items]
Common unit, issued (in shares)		18,642,410	18,642,410
Common unit, outstanding (in shares)		18,642,410	18,642,410
Class X Umbrella Units | Andersen Aggregator LLC | AT Umbrella LLC
Noncontrolling Interest [Line Items]
Shares, outstanding (in shares)		94,346,043	94,346,043
Class B Common Stock
Noncontrolling Interest [Line Items]
Common stock, shares, outstanding (in shares)		94,346,043	94,346,043	99,166,563
Common stock, shares, issued (in shares)		94,346,043	94,346,043	99,166,563
Class B Common Stock | Secondary Offering
Noncontrolling Interest [Line Items]
Shares repurchased (in shares)	102,000
Class B Common Stock | Andersen Aggregator LLC
Noncontrolling Interest [Line Items]
Common stock, shares, outstanding (in shares)		92,735,875	92,735,875
Common stock, shares, issued (in shares)		92,735,875	92,735,875
Class B Common Stock | Andersen Aggregator LLC On Behalf of Directors
Noncontrolling Interest [Line Items]
Common stock, shares, outstanding (in shares)		1,610,168	1,610,168
AT Umbrella LLC
Noncontrolling Interest [Line Items]
Equity method investment, ownership percentage		16.50%	16.50%
AT Umbrella LLC | Class A Common Stock | Resale Offering
Noncontrolling Interest [Line Items]
Shares issued on exchange of units (in shares)	4,927,125
AT Umbrella LLC | Class A Common Stock | Transaction Excluded From Resale Offering
Noncontrolling Interest [Line Items]
Shares issued on exchange of units (in shares)	102,000