CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Income Statement [Abstract]
Revenues	$ 364.8	$ 362.5	$ 1,080.8	$ 1,093.6
Costs and expenses:
Cost of products sold	258.6	274.8	783.2	818.1
Selling, general and administrative	74.6	71.6	229.5	212.8
Intangible amortization	2.0	1.7	6.0	2.7
Special charges, net	2.0	1.0	3.4	4.6
Other operating expenses	0.0	0.0	1.8	0.0
Operating income	27.6	13.4	56.9	55.4
Other income, net	1.0	0.7	10.1	3.9
Interest expense	(5.0)	(5.9)	(15.6)	(15.3)
Interest income	0.4	0.3	1.3	1.1
Income from continuing operations before income taxes	24.0	8.5	52.7	45.1
Income tax provision	(2.8)	(1.7)	(11.5)	(6.2)
Income from continuing operations	21.2	6.8	41.2	38.9
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	0.3	(0.2)	(1.3)	3.1
Gain (loss) from discontinued operations, net of tax	0.3	(0.2)	(1.3)	3.1
Net income	$ 21.5	$ 6.6	$ 39.9	$ 42.0
Basic income per share of common stock:
Income from continuing operations (in dollars per share)	$ 0.48	$ 0.16	$ 0.94	$ 0.91
Income (loss) from discontinued operations (in dollars per share)	0.01	(0.01)	(0.03)	0.07
Net income per share (in dollars per share)	$ 0.49	$ 0.15	$ 0.91	$ 0.98
Weighted-average number of common shares outstanding — basic	44,072	43,080	43,870	42,948
Diluted income per share of common stock:
Income from continuing operations (in dollars per share)	$ 0.47	$ 0.15	$ 0.92	$ 0.87
Income (loss) from discontinued operations (in dollars per share)	0.01	0	(0.03)	0.07
Net income per share (in dollars per share)	$ 0.48	$ 0.15	$ 0.89	$ 0.94
Weighted-average number of common shares outstanding — diluted	45,176	44,904	44,861	44,648
Comprehensive income	$ 18.7	$ 5.6	$ 34.9	$ 42.4