Earnings per Share and Stock Repurchase Program (Details) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021 USD ($) $ / shares shares	Sep. 27, 2020 USD ($) $ / shares shares	Sep. 26, 2021 USD ($) $ / shares shares	Sep. 27, 2020 USD ($) $ / shares shares	Dec. 31, 2020	Feb. 06, 2019 USD ($)
Net (loss) income
Net income	$ 46.4	$ 32.9	$ 125.6	$ 85.1
Shares
Shares (in shares) | shares	33,700,000	33,800,000	33,800,000	33,900,000
Per Share Amount
Net income (in dollars per share) | $ / shares	$ 1.38	$ 0.97	$ 3.72	$ 2.51
Dilutive securities, principally common stock options
Common stock equivalents (in shares) | shares	200,000	100,000	100,000	100,000
Common stock equivalents (in dollars per share) | $ / shares	$ (0.01)		$ (0.02)	$ (0.01)
Net (loss) income
Net income	$ 46.4	$ 32.9	$ 125.6	$ 85.1
Weighted average number of shares:
Shares (in shares) | shares	33,900,000	33,900,000	33,900,000	34,000,000.0
Securities not included in the computation of diluted EPS
Net income (in dollars per share) | $ / shares	$ 1.37	$ 0.97	$ 3.70	$ 2.50
Dilutive securities, principally common stock options
Options to purchase shares of Class A common stock, anti-dilutive | shares	0	0	0	0
Shares repurchased
Number of shares repurchased | shares	25,375	41,142	87,445	294,677
Stock Repurchased During Period, Value	$ 4.0	$ 3.7	$ 11.8	$ 24.8
Cost of shares repurchased			$ 11.8	$ 24.8
Class A
Common Stock
Common Stock, votes per share (Number of votes)	1		1		1
Class B
Common Stock
Common Stock, votes per share (Number of votes)	10		10		10
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	$ 101.6		$ 101.6