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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, 2019 | Sep. 27, 2019 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 31, 2018 | Sep. 28, 2018 | Jun. 29, 2018 | Mar. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit for reportable segments |  |  |  |  |  |  |  |  | $ 2,046.2 | $ 2,305.5 | $ 2,080.2
Gross profit | $ 485.7 | $ 475.2 | $ 499.0 | $ 513.7 | $ 569.7 | $ 596.6 | $ 555.0 | $ 517.4 | 1,973.6 | 2,238.7 | 2,035.6
Gross profit for reportable segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross profit for reportable segments |  |  |  |  |  |  |  |  | 2,046.2 | 2,305.5 | 2,080.2
Less: unallocated manufacturing costs |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Less: unallocated manufacturing costs |  |  |  |  |  |  |  |  | $ (72.6) | $ (66.8) | $ (44.6)

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