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Related Party Transactions (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 26, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019 | Dec. 28, 2019
Related Party Transaction |  |  |  |  |  |
Cost method investments |  | $ 0.4 |  | $ 0.4 |  |
MWT |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Loss on disposal | $ 2.6 |  |  |  |  |
Powersem |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Ownership percentage (percent) |  | 45.00% |  | 45.00% |  |
Revenue from related parties |  | $ 0.3 | $ 0.1 | $ 0.7 | $ 0.2 |
Purchase from related party |  | 0.8 | 0.9 | 1.0 | 1.7 |
Receivable from related parties |  | 0.1 |  | 0.1 |  | $ 0.0
Payables to related parties |  | $ 0.2 |  | $ 0.2 |  | 0.2
EB Tech |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Ownership percentage (percent) |  | 19.00% |  | 19.00% |  |
Revenue from related parties |  | $ 0.0 | 0.0 | $ 0.0 | 0.0 |
Purchase from related party |  | 0.0 | 0.1 | 0.0 | 0.2 |
Receivable from related parties |  | 0.0 |  | 0.0 |  | 0.0
Payables to related parties |  | $ 0.0 |  | $ 0.0 |  | 0.0
ATEC |  |  |  |  |  |
Related Party Transaction |  |  |  |  |  |
Ownership percentage (percent) |  | 24.00% |  | 24.00% |  |
Revenue from related parties |  | $ 0.0 | 0.0 | $ 0.0 | 0.0 |
Purchase from related party |  | 1.6 | $ 2.3 | 3.4 | $ 3.8 |
Receivable from related parties |  | 0.0 |  | 0.0 |  | 0.0
Payables to related parties |  | $ 0.1 |  | $ 0.1 |  | $ 0.1

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