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Venture Capital Investments and Marketable Securities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Schedule of Equity Method Investments [Line Items]
Committed contribution	$ 108.4
Venture capital investments	54.9
Dividends received	7.1	$ 4.4
Gain (loss) from venture capital investments	$ 6.5	$ 4.1
Minimum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	0.60%
Maximum
Schedule of Equity Method Investments [Line Items]
Ownership percentage	12.00%

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Equity Method Investment, Investment Commitment

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Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(10))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 28
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-URI http://asc.fasb.org/extlink&oid=98514028&loc=SL94080555-108585

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-Topic 323
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