CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Income Statement [Abstract]
Revenues	$ 363.4	$ 364.8	$ 1,105.9	$ 1,080.8
Costs and expenses:
Cost of products sold	255.1	258.6	769.5	783.2
Selling, general and administrative	74.6	74.6	229.3	229.5
Intangible amortization	3.3	2.0	8.3	6.0
Special charges, net	0.4	2.0	2.1	3.4
Other operating (income) expense	0.0	0.0	(0.4)	1.8
Operating income	30.0	27.6	97.1	56.9
Other income, net	2.9	1.0	9.4	10.1
Interest expense	(4.5)	(5.0)	(14.0)	(15.6)
Interest income	0.1	0.4	0.2	1.3
Income from continuing operations before income taxes	28.5	24.0	92.7	52.7
Income tax provision	(5.8)	(2.8)	(18.9)	(11.5)
Income from continuing operations	22.7	21.2	73.8	41.2
Income (loss) from discontinued operations, net of tax	0.0	0.0	0.0	0.0
Gain (loss) on disposition of discontinued operations, net of tax	0.1	0.3	(1.2)	(1.3)
Income (loss) from discontinued operations, net of tax	0.1	0.3	(1.2)	(1.3)
Net income	$ 22.8	$ 21.5	$ 72.6	$ 39.9
Basic income per share of common stock:
Income from continuing operations (in dollars per share)	$ 0.51	$ 0.48	$ 1.66	$ 0.94
Income (loss) from discontinued operations (in dollars per share)	0	0.01	(0.03)	(0.03)
Net income per share (in dollars per share)	$ 0.51	$ 0.49	$ 1.63	$ 0.91
Weighted-average number of common shares outstanding — basic	44,708	44,072	44,538	43,870
Diluted income per share of common stock:
Income from continuing operations (in dollars per share)	$ 0.49	$ 0.47	$ 1.62	$ 0.92
Income (loss) from discontinued operations (in dollars per share)	0.01	0.01	(0.03)	(0.03)
Net income per share (in dollars per share)	$ 0.50	$ 0.48	$ 1.59	$ 0.89
Weighted-average number of common shares outstanding — diluted	45,894	45,176	45,694	44,861
Comprehensive income	$ 24.7	$ 18.7	$ 65.5	$ 34.9