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Revenue and Segment Information - Reconciliations Of Segment Gross Profit And Segment Operating Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Sep. 28, 2018 | Sep. 29, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Gross profit for reporting segments | $ 602.9 | $ 533.2 | $ 1,699.6 | $ 1,553.1
Gross profit | 596.6 | 524.0 | 1,669.0 | 1,519.1
Operating Segments |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Gross profit for reporting segments | 602.9 | 533.2 | 1,699.6 | 1,553.1
Less: unallocated manufacturing costs |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Less: unallocated manufacturing costs | $ (6.3) | $ (9.2) | $ (30.6) | $ (34.0)

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