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Financial Instruments Financial Instruments (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 30, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Senior Notes Due 2021 [Member] |  |  |
Derivative [Line Items] |  |  |
Interest Rate | 4.625% | 4.625% | 4.625%
Debentures Due 2023 [Member] |  |  |
Derivative [Line Items] |  |  |
Interest Rate | 7.375% | 7.375% | 7.375%
Foreign Exchange Forward [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Values | $ 493,800,000 | $ 436,000,000 | $ 424,100,000
Foreign Exchange Option [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Values | 0 | 18,000,000 | 27,200,000
Foreign Exchange Contracts [Member] |  |  |
Derivative [Line Items] |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified Within Twelve Months | 6,800,000 |  |
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Values | 200,000,000 | 200,000,000 | 200,000,000
Interest Rate Swap [Member] | Senior Notes Due 2021 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Values | 150,000,000 | 150,000,000 | 150,000,000
Interest Rate Swap [Member] | Debentures Due 2023 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Values | 50,000,000 | 50,000,000 | 50,000,000
Forward-Starting Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified Within Twelve Months | (600,000) |  |
Amount of Gain (Loss) Estimated to be Reclassified from Accumulated Other Comprehensive Loss to Cost of Sales or Interest Expense | $ (2,400,000) | $ (3,200,000) | $ (2,500,000)

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80845-113994 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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