Consolidated Statements Shareholders' Equity - USD ($) $ in Millions	Total	Class A Common Shares	Class B Common Stock	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2023	$ 2,956.8			$ 0.0	$ 1,595.2	$ 1,431.9	$ (3.4)	$ (66.9)
Increase (Decrease) in Stockholders' Equity
Net income	18.5			0.0	0.0	18.5	0.0	0.0
Other comprehensive (loss) income	(0.2)			0.0	0.0	0.0	(0.2)	0.0
Share-based compensation expense	1.5			0.0	1.5	0.0	0.0	0.0
Dividends declared per share		$ 0.095	$ 0.095
Dividends declared	(16.7)			0.0	0.0	(16.7)	0.0	0.0
Repurchases of common stock	(13.0)			0.0	0.0	0.0	0.0	(13.0)
Exercise of employee stock options	1.5			0.0	1.5	0.0	0.0	0.0
Shares withheld for employee taxes	(6.4)			0.0	(6.4)	0.0	0.0	0.0
Balance at Mar. 31, 2024	2,942.0			0.0	1,591.8	1,433.7	(3.6)	(79.9)
Balance at Dec. 31, 2023	2,956.8			0.0	1,595.2	1,431.9	(3.4)	(66.9)
Increase (Decrease) in Stockholders' Equity
Net income	53.8
Balance at Jun. 30, 2024	2,951.6			0.0	1,596.1	1,452.1	(3.9)	(92.7)
Balance at Mar. 31, 2024	2,942.0			0.0	1,591.8	1,433.7	(3.6)	(79.9)
Increase (Decrease) in Stockholders' Equity
Net income	35.3			0.0	0.0	35.3	0.0	0.0
Other comprehensive (loss) income	(0.3)			0.0	0.0	0.0	(0.3)	0.0
Share-based compensation expense	4.3			0.0	4.3	0.0	0.0	0.0
Dividends declared per share		0.095	0.095
Dividends declared	(16.9)			0.0	0.0	(16.9)	0.0	0.0
Repurchases of common stock	(12.8)			0.0	0.0	0.0	0.0	(12.8)
Balance at Jun. 30, 2024	2,951.6			0.0	1,596.1	1,452.1	(3.9)	(92.7)
Balance at Dec. 31, 2024	2,986.9			0.0	1,605.3	1,481.8	(3.8)	(96.4)
Increase (Decrease) in Stockholders' Equity
Net income	26.1			0.0	0.0	26.1	0.0	0.0
Other comprehensive (loss) income	0.5			0.0	0.0	0.0	0.5	0.0
Share-based compensation expense	4.9			0.0	4.9	0.0	0.0	0.0
Dividends declared per share		0.095	0.095
Dividends declared	(16.8)			0.0	0.0	(16.8)	0.0	0.0
Repurchases of common stock	(8.3)			0.0	0.0	0.0	0.0	(8.3)
Shares withheld for employee taxes	(5.1)			0.0	(5.1)	0.0	0.0	0.0
Balance at Mar. 31, 2025	2,988.2			0.0	1,605.1	1,491.1	(3.3)	(104.7)
Balance at Dec. 31, 2024	2,986.9			0.0	1,605.3	1,481.8	(3.8)	(96.4)
Increase (Decrease) in Stockholders' Equity
Net income	62.1
Balance at Jun. 30, 2025	3,012.9			0.0	1,610.0	1,510.2	(2.6)	(104.7)
Balance at Mar. 31, 2025	2,988.2			0.0	1,605.1	1,491.1	(3.3)	(104.7)
Increase (Decrease) in Stockholders' Equity
Net income	36.0			0.0	0.0	36.0	0.0	0.0
Other comprehensive (loss) income	0.7			0.0	0.0	0.0	0.7	0.0
Share-based compensation expense	4.9			0.0	4.9	0.0	0.0	0.0
Dividends declared per share		$ 0.095	$ 0.095
Dividends declared	(16.9)			0.0	0.0	(16.9)	0.0	0.0
Balance at Jun. 30, 2025	$ 3,012.9			$ 0.0	$ 1,610.0	$ 1,510.2	$ (2.6)	$ (104.7)