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Revenue and Segment Information - Reconciliation Of Operating Profit (Loss) From Segments To Consolidated (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Oct. 02, 2020 | Jul. 03, 2020 | Apr. 03, 2020 | Dec. 31, 2019 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit for reportable segments |  |  |  |  |  |  |  |  | $ 1,769.9 | $ 2,046.2 | $ 2,305.5
Gross profit | $ 497.6 | $ 441.2 | $ 374.3 | $ 402.7 | $ 485.7 | $ 475.2 | $ 499.0 | $ 513.7 | 1,715.8 | 1,973.6 | 2,238.7
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit for reportable segments |  |  |  |  |  |  |  |  | 1,769.9 | 2,046.2 | 2,305.5
Segment Reconciling Items |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less: unallocated manufacturing costs |  |  |  |  |  |  |  |  | $ (54.1) | $ (72.6) | $ (66.8)

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