Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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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.

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No definition available.

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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Derivative Instruments (Narrative) (Details) € in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jul. 01, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jul. 01, 2018 USD ($)	Jun. 30, 2019 EUR (€)	Jun. 30, 2019 USD ($)	Dec. 30, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Long-term debt						$ 792.7	$ 748.8
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Income (expense) related to derivative instruments not designated as cash flow hedges recognized in other income and expense	$ (0.7)	$ (17.0)	$ 0.9	$ (17.8)
Foreign Exchange Forward \| Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Expected reclassification of gain (loss) over the next 12 months						(0.2)
Foreign Exchange Forward \| Designated as Hedging Instrument \| Sell US Dollars and Buy Canadian Dollars
Derivative Instruments, Gain (Loss) [Line Items]
Amount of foreign currency contract						80.1
Currency Swap \| Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Expected reclassification of gain (loss) over the next 12 months						0.1
Term Loan Due Oct 2019 \| Term Loans
Derivative Instruments, Gain (Loss) [Line Items]
Long-term debt					€ 93.0	100.0
e2v Limited UK \| Foreign Exchange Forward \| Designated as Hedging Instrument \| Sell US Dollars and Buy Great Britain Pounds
Derivative Instruments, Gain (Loss) [Line Items]
Amount of foreign currency contract						$ 21.2