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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-Topic 470
-SubTopic 20
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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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Aggregate net fair value of all derivative instruments designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations.

+ References

No definition available.

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- Definition

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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- Definition

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
	Mar. 31, 2019 USD ($)	Apr. 01, 2018 USD ($)	Mar. 31, 2019 EUR (€)	Mar. 31, 2019 USD ($)	Dec. 30, 2018 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Long-term debt				$ 857.5	$ 748.8
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Derivative instruments in hedges, at fair value				2.0
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	$ 1.6	$ (0.8)
Foreign Exchange Forward \| Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Expected reclassification of gain (loss) over the next 12 months				1.2
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				80.9
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				$ 17.4