Goodwill and Intangibles - Intangibles (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 27, 2020	Sep. 27, 2020	Sep. 29, 2019	Dec. 31, 2019
Intangible assets subject to amortization
Gross Carrying Amount	$ 338.3	$ 338.3		$ 336.1
Accumulated Amortization	(231.9)	(231.9)		(220.5)
Net Carrying Amount	106.4	106.4		115.6
Indefinite-lived intangible assets
Indefinite-lived intangible assets	36.5	36.5		35.8
Intangible assets
Gross Carrying Amount	374.8	374.8		371.9
Net Carrying Amount	142.9	142.9		151.4
Aggregate amortization expense for amortized intangible assets	3.8	11.4	$ 11.6
Patents
Intangible assets subject to amortization
Gross Carrying Amount	16.1	16.1		16.1
Accumulated Amortization	(16.0)	(16.0)		(15.9)
Net Carrying Amount	0.1	0.1		0.2
Customer relationships
Intangible assets subject to amortization
Gross Carrying Amount	234.4	234.4		232.8
Accumulated Amortization	(163.3)	(163.3)		(156.3)
Net Carrying Amount	71.1	71.1		76.5
Technology
Intangible assets subject to amortization
Gross Carrying Amount	56.8	56.8		56.9
Accumulated Amortization	(34.9)	(34.9)		(31.6)
Net Carrying Amount	21.9	21.9		25.3
Trade name
Intangible assets subject to amortization
Gross Carrying Amount	26.7	26.7		26.0
Accumulated Amortization	(14.0)	(14.0)		(13.1)
Net Carrying Amount	12.7	12.7		12.9
Other
Intangible assets subject to amortization
Gross Carrying Amount	4.3	4.3		4.3
Accumulated Amortization	(3.7)	(3.7)		(3.6)
Net Carrying Amount	0.6	$ 0.6		$ 0.7
AVG | Customer relationships
Intangible assets
Finite-lived Intangible Assets Acquired	2.6
AVG | Trade name
Intangible assets
Finite-lived Intangible Assets Acquired	$ 0.6