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Revenue and Segment Information - Segment Information Of Revenues, Gross Profit And Operating Income (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2018 USD ($)	Sep. 29, 2017 USD ($)	Sep. 28, 2018 USD ($) segment	Sep. 29, 2017 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			3
Number of operating segments | segment			3
Segment Reporting Information [Line Items]
Revenue	$ 1,541.7	$ 1,390.9	$ 4,375.2	$ 4,165.6
Gross profit	602.9	533.2	1,699.6	1,553.1
Power Solutions Group
Segment Reporting Information [Line Items]
Revenue	810.2	706.4	2,251.0	2,121.6
Gross profit	297.9	244.1	804.2	716.6
Analog Solutions Group
Segment Reporting Information [Line Items]
Revenue	531.7	491.6	1,541.1	1,463.7
Gross profit	224.3	208.3	650.4	613.4
Intelligent Sensing Group
Segment Reporting Information [Line Items]
Revenue	199.8	192.9	583.1	580.3
Gross profit	$ 80.7	$ 80.8	$ 245.0	$ 223.1

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Segment Reporting Information Gross Profit

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Topic 606
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-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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