Earnings per Share and Stock Repurchase Program (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 25, 2022	Sep. 26, 2021	Feb. 06, 2019
Net (loss) income
Net income	$ 58.7	$ 46.4	$ 182.9	$ 125.6
Shares
Shares (in shares)	33,400,000	33,700,000	33,500,000	33,800,000
Per Share Amount
Net income (in dollars per share)	$ 1.76	$ 1.38	$ 5.46	$ 3.72
Dilutive securities, principally common stock options
Common stock equivalents (in shares)	100,000	200,000	200,000	100,000
Common stock equivalents (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.03)	$ (0.02)
Net (loss) income
Net income	$ 58.7	$ 46.4	$ 182.9	$ 125.6
Weighted average number of shares:
Shares (in shares)	33,500,000	33,900,000	33,700,000	33,900,000
Securities not included in the computation of diluted EPS
Net income (in dollars per share)	$ 1.75	$ 1.37	$ 5.43	$ 3.70
Dilutive securities, principally common stock options
Options to purchase shares of Class A common stock, anti-dilutive	0	0	0	0
Shares repurchased
Number of shares repurchased	29,333	25,375	462,956	87,445
Stock Repurchased During Period, Value	$ 3.9	$ 4.0	$ 65.1	$ 11.8
February 6, 2019 | Class A
Shares repurchased
Value of shares of the entity's Class A common stock authorized to be repurchased					$ 150.0
Remaining authorized repurchase amount	$ 32.3		$ 32.3