CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (UNAUDITED) - USD ($) $ in Millions	Total	Class A Common Stock	Total shareholders’ equity	Common Stock Class A Common Stock	Treasury Stock	Retained Earnings	Additional paid-in capital
Common stock, shares outstanding (in shares) at Dec. 31, 2022				25,446,292
Treasury stock, beginning (in shares) at Dec. 31, 2022					(551,828)
Balance at the beginning of the period at Dec. 31, 2022			$ 266.3	$ 0.3	$ (3.8)	$ 7.2	$ 262.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under share-based compensation plans (in shares)				390,612
Shares withheld for taxes on equity transactions (in shares)				(92,835)
Repurchase of Class A Common Stock (in shares)					(781,000)
Repurchase of Class A Common Stock			(8.6)		$ (8.6)
Net income	$ 21.7		21.7			21.7
Dividends declared			(1.3)			(1.3)
Equity based compensation			3.4				3.4
Shares withheld for taxes for equity compensation			(1.0)				(1.0)
Common stock, shares outstanding (in shares) at Sep. 30, 2023				25,744,069
Treasury stock, ending (in shares) at Sep. 30, 2023					(1,332,828)
Balance at the end of the period at Sep. 30, 2023			280.5	$ 0.3	$ (12.4)	27.6	265.0
Common stock, shares outstanding (in shares) at Jun. 30, 2023				25,689,807
Treasury stock, beginning (in shares) at Jun. 30, 2023					(1,099,928)
Balance at the beginning of the period at Jun. 30, 2023			274.0	$ 0.3	$ (9.7)	19.5	263.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under share-based compensation plans (in shares)				59,996
Shares withheld for taxes on equity transactions (in shares)				(5,734)
Repurchase of Class A Common Stock (in shares)					(232,900)
Repurchase of Class A Common Stock			(2.7)		$ (2.7)
Net income			9.4			9.4
Dividends declared			(1.3)			(1.3)
Equity based compensation			1.1				1.1
Common stock, shares outstanding (in shares) at Sep. 30, 2023				25,744,069
Treasury stock, ending (in shares) at Sep. 30, 2023					(1,332,828)
Balance at the end of the period at Sep. 30, 2023			280.5	$ 0.3	$ (12.4)	27.6	265.0
Common stock, shares outstanding (in shares) at Dec. 31, 2023		23,398,689		25,756,017
Treasury stock, beginning (in shares) at Dec. 31, 2023	(2,357,328)				(2,357,328)
Balance at the beginning of the period at Dec. 31, 2023			271.8	$ 0.3	$ (23.1)	28.4	266.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under share-based compensation plans (in shares)				527,717
Shares withheld for taxes on equity transactions (in shares)				(160,894)
Repurchase of Class A Common Stock (in shares)					(1,520,300)
Repurchase of Class A Common Stock			(15.5)		$ (15.5)
Net income	$ 12.6		12.6			12.6
Dividends declared			(3.5)			(3.5)
Equity based compensation			4.0				4.0
Shares withheld for taxes for equity compensation			(1.8)				(1.8)
Common stock, shares outstanding (in shares) at Sep. 30, 2024		22,245,212		26,122,840
Treasury stock, ending (in shares) at Sep. 30, 2024	(3,877,628)				(3,877,628)
Balance at the end of the period at Sep. 30, 2024			267.6	$ 0.3	$ (38.6)	37.5	268.4
Common stock, shares outstanding (in shares) at Jun. 30, 2024				26,087,524
Treasury stock, beginning (in shares) at Jun. 30, 2024					(3,722,428)
Balance at the beginning of the period at Jun. 30, 2024			260.5	$ 0.3	$ (36.9)	30.0	267.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares under share-based compensation plans (in shares)				44,387
Shares withheld for taxes on equity transactions (in shares)				(9,071)
Repurchase of Class A Common Stock (in shares)					(155,200)
Repurchase of Class A Common Stock			(1.7)		$ (1.7)
Net income			8.7			8.7
Dividends declared			(1.2)			(1.2)
Equity based compensation			1.4				1.4
Shares withheld for taxes for equity compensation			(0.1)				(0.1)
Common stock, shares outstanding (in shares) at Sep. 30, 2024		22,245,212		26,122,840
Treasury stock, ending (in shares) at Sep. 30, 2024	(3,877,628)				(3,877,628)
Balance at the end of the period at Sep. 30, 2024			$ 267.6	$ 0.3	$ (38.6)	$ 37.5	$ 268.4