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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Business Segments (Narrative) (Details) $ in Millions	3 Months Ended								12 Months Ended
Business Segments (Narrative) (Details) $ in Millions	Dec. 29, 2019 USD ($) product_line	Sep. 29, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jul. 01, 2018 USD ($)	Apr. 01, 2018 USD ($)	Dec. 29, 2019 USD ($) segment product_line	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment									4
Net Sales	$ 834.2	$ 802.2	$ 782.0	$ 745.2	$ 748.4	$ 725.3	$ 732.5	$ 695.6	$ 3,163.6	$ 2,901.8	$ 2,603.8
Amount remaining to be paid for severance and facility consolidations	$ 1.5								$ 1.5
Sales to individual countries outside the United States									0.00%
Sales between business segments									$ 30.3	23.4	22.8
United Kingdom
Segment Reporting Information [Line Items]
Net Sales									251.7	178.8	197.5
United States Department of Defense
Segment Reporting Information [Line Items]
Net Sales									545.5	494.9	479.7
Countries Other Than United States
Segment Reporting Information [Line Items]
Net Sales									1,391.6	1,353.7	1,208.5
Countries Other Than United States \| Domestic Operations
Segment Reporting Information [Line Items]
Net Sales									638.0	600.5	555.5
Operating Segments
Segment Reporting Information [Line Items]
Net Sales									3,163.6	2,901.8	2,603.8
Instrumentation
Segment Reporting Information [Line Items]
Net Sales									$ 1,105.1	1,021.2	953.9
Number of product lines \| product_line	3								3
Instrumentation \| Operating Segments
Segment Reporting Information [Line Items]
Net Sales	$ 301.6	282.9	264.1	256.5	263.4	256.2	262.6	239.0	$ 1,105.1	1,021.2	953.9
Aerospace and Defense Electronics
Segment Reporting Information [Line Items]
Net Sales									$ 690.1	640.2
Number of product lines \| product_line	1								1
Aerospace and Defense Electronics \| Operating Segments
Segment Reporting Information [Line Items]
Net Sales	$ 170.4	177.1	176.0	166.6	166.0	160.3	157.5	156.4	$ 690.1	640.2	591.2
Aerospace and Defense Electronics \| Operating Segments \| Electronic Manufacturing Services Products
Segment Reporting Information [Line Items]
Net Sales										(76.2)
Digital Imaging
Segment Reporting Information [Line Items]
Net Sales									$ 992.9	875.3
Number of product lines \| product_line	1								1
Digital Imaging \| Operating Segments
Segment Reporting Information [Line Items]
Net Sales	$ 268.1	244.0	248.4	232.4	223.3	220.7	223.0	208.3	$ 992.9	875.3	710.4
Engineered Systems
Segment Reporting Information [Line Items]
Net Sales									$ 375.5	365.1
Number of product lines \| product_line	1								1
Engineered Systems \| Operating Segments
Segment Reporting Information [Line Items]
Net Sales	$ 94.1	$ 98.2	$ 93.5	$ 89.7	$ 95.7	$ 88.1	$ 89.4	$ 91.9	$ 375.5	365.1	$ 348.3
Engineered Systems \| Operating Segments \| Electronic Manufacturing Services Products
Segment Reporting Information [Line Items]
Net Sales										76.2
Engineered Systems \| Operating Segments \| Microwave and Manufactured Composite Parts \| United Kingdom
Segment Reporting Information [Line Items]
Net Sales										$ (20.0)