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Reporting Segment And Geographic Information (Schedule Of Revenue, Operating Income And Identifiable Assets By Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 30, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 708.4 | $ 670.0 | $ 661.9 | $ 613.9 | $ 585.5 | $ 584.1 | $ 609.6 | $ 583.0 | $ 2,654.2 | [1] | $ 2,362.2 | [1] | $ 2,290.4 | [1]
Operating Income (Loss) |  |  |  |  |  |  |  |  | 246.0 |  | 181.0 |  | 154.4 |
Depreciation |  |  |  |  |  |  |  |  | 34.6 |  | 37.0 |  | 36.7 |
Accounts receivable | 414.8 |  |  |  | 354.8 |  |  |  | 414.8 |  | 354.8 |  |  |
Inventories | 271.8 |  |  |  | 218.8 |  |  |  | 271.8 |  | 218.8 |  |  |
Goodwill | 2,287.1 |  |  |  | 2,077.6 |  |  |  | 2,287.1 |  | 2,077.6 |  |  |
Building and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 834.9 |  | 743.5 |  | 688.6 |
Accounts receivable | 118.5 |  |  |  | 104.7 |  |  |  | 118.5 |  | 104.7 |  |  |
Inventories | 62.1 |  |  |  | 51.3 |  |  |  | 62.1 |  | 51.3 |  |  |
Goodwill | 706.8 |  |  |  | 663.7 |  |  |  | 706.8 |  | 663.7 |  |  |
Geospatial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 661.2 |  | 634.7 |  | 672.8 |
Accounts receivable | 117.7 |  |  |  | 108.3 |  |  |  | 117.7 |  | 108.3 |  |  |
Inventories | 110.7 |  |  |  | 100.4 |  |  |  | 110.7 |  | 100.4 |  |  |
Goodwill | 415.3 |  |  |  | 405.1 |  |  |  | 415.3 |  | 405.1 |  |  |
Resources and Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 476.9 |  | 395.7 |  | 381.8 |
Accounts receivable | 76.9 |  |  |  | 65.5 |  |  |  | 76.9 |  | 65.5 |  |  |
Inventories | 45.3 |  |  |  | 31.0 |  |  |  | 45.3 |  | 31.0 |  |  |
Goodwill | 314.5 |  |  |  | 217.7 |  |  |  | 314.5 |  | 217.7 |  |  |
Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 681.2 |  | 588.3 |  | 547.2 |
Accounts receivable | 101.7 |  |  |  | 76.3 |  |  |  | 101.7 |  | 76.3 |  |  |
Inventories | 53.7 |  |  |  | 36.1 |  |  |  | 53.7 |  | 36.1 |  |  |
Goodwill | $ 850.5 |  |  |  | $ 791.1 |  |  |  | 850.5 |  | 791.1 |  |  |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 567.7 |  | 476.0 |  | 459.9 |
Operating Segments [Member] | Building and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 179.9 |  | 133.9 |  | 108.2 |
Operating Segments [Member] | Geospatial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 130.9 |  | 120.8 |  | 135.3 |
Operating Segments [Member] | Resources and Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 136.3 |  | 118.4 |  | 109.9 |
Operating Segments [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  | 120.6 |  | 102.9 |  | 106.5 |
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 20.0 |  | 21.0 |  | 21.3 |
Segment Reconciling Items [Member] | Building and Infrastructure [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 6.2 |  | 7.0 |  | 7.8 |
Segment Reconciling Items [Member] | Geospatial [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 5.4 |  | 6.5 |  | 6.4 |
Segment Reconciling Items [Member] | Resources and Utilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | 3.2 |  | 2.0 |  | 1.9 |
Segment Reconciling Items [Member] | Transportation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  |  |  |  |  |  |  |  | $ 5.2 |  | $ 5.5 |  | $ 5.2 |
[1] | Revenue is attributed to countries based on the location of the customer.

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