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Background and Basis of Presentation (Details) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 28, 2018 USD ($) | Sep. 29, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 28, 2018 USD ($) segment | Sep. 29, 2017 USD ($) | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  | 3 |  |  |
Number of reportable segments | segment |  |  |  | 3 |  |  |
Accumulated earnings | $ 814.0 |  |  | $ 814.0 |  |  | $ 351.5
Revenue | 1,541.7 | $ 1,390.9 |  | 4,375.2 | $ 4,165.6 |  |
Income before income taxes | 216.0 | 168.3 |  | $ 566.3 | 426.5 |  |
Distributors, repayment period |  |  |  | 30 days |  |  |
Repayment period of account receivable, cash discount, after the date of shipment |  |  |  | 10 days |  |  |
Standard product warranty, period from the date of shipment |  |  |  | 2 years |  |  |
Sales Agreements |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Contract with customer, revenue recognized | 1,534.7 |  |  | $ 4,355.4 |  |  |
Product Development Agreements |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Contract with customer, revenue recognized | 7.0 |  |  | 19.8 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accumulated earnings |  |  |  |  |  | $ 2.1 |
Revenue | 0.1 |  | $ 155.1 | 2.9 |  |  |
Income before income taxes |  |  | $ 59.0 |  |  |  |
Intelligent Sensing Group |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Revenue | $ 199.8 | $ 192.9 |  | $ 583.1 | $ 580.3 |  |
Standard product warranty, period from the date of shipment |  |  |  | 1 year |  |  |

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