The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Goodwill and Intangibles - Intangibles (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020	Sep. 26, 2021	Sep. 27, 2020	Dec. 31, 2020
Intangible assets subject to amortization
Gross Carrying Amount	$ 341.2		$ 341.2		$ 341.6
Accumulated Amortization	(247.5)		(247.5)		(237.0)
Net Carrying Amount	93.7		93.7		104.6
Indefinite-lived intangible assets
Indefinite-lived intangible assets	36.5		36.5		37.2
Intangible assets
Gross Carrying Amount	377.7		377.7		378.8
Net Carrying Amount	130.2		130.2		141.8
Aggregate amortization expense for amortized intangible assets	3.2	$ 3.8	10.5	$ 11.4
Patents
Intangible assets subject to amortization
Gross Carrying Amount	16.1		16.1		16.1
Accumulated Amortization	(16.1)		(16.1)		(16.0)
Net Carrying Amount					0.1
Customer relationships
Intangible assets subject to amortization
Gross Carrying Amount	235.8		235.8		236.2
Accumulated Amortization	(171.6)		(171.6)		(165.8)
Net Carrying Amount	64.2		64.2		70.4
Technology
Intangible assets subject to amortization
Gross Carrying Amount	58.1		58.1		58.0
Accumulated Amortization	(39.6)		(39.6)		(36.4)
Net Carrying Amount	18.5		18.5		21.6
Trade name
Intangible assets subject to amortization
Gross Carrying Amount	26.9		26.9		27.0
Accumulated Amortization	(16.5)		(16.5)		(15.1)
Net Carrying Amount	10.4		10.4		11.9
Other
Intangible assets subject to amortization
Gross Carrying Amount	4.3		4.3		4.3
Accumulated Amortization	(3.7)		(3.7)		(3.7)
Net Carrying Amount	$ 0.6		$ 0.6		$ 0.6