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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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