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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019 | Dec. 29, 2019
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Revenue recognized | $ 3.5 | $ 5.3 | $ 23.5 | $ 26.6 |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Contract assets, net change |  |  | 13.3 |  |
Contract liabilities, net change |  |  | 2.0 |  |
Contract assets | 192.7 |  | 192.7 |  | $ 179.4
Unbilled Revenues | T for C |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Contract assets | 11.5 |  | 11.5 |  | 11.5
Unbilled Revenues | International Customer |  |  |  |  |
Revenue Recognition, Multiple-deliverable Arrangements [Line Items] |  |  |  |  |
Contract assets | $ 10.0 |  | $ 10.0 |  | $ 10.0

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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