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Business Combinations (Narrative) (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 02, 2018 USD ($) | Feb. 02, 2018 USD ($) | Dec. 28, 2018 USD ($) segment acquisition | Dec. 29, 2017 USD ($) acquisition | Dec. 30, 2016 USD ($) acquisition
Business Acquisition [Line Items] |  |  |  |  |  |
Number of Businesses Acquired | acquisition |  |  | 6 | 10 |  | 4
Payments to Acquire Businesses, Gross |  |  | $ 1,782.9 | $ 331.2 |  | $ 27.6
Business Combination Pro Forma Information Revenue Of Acquiree Since Acquisition Date Actual Percentage Of Total Revenue |  |  | 5.00% | 2.00% |  | 1.00%
Business Combination Valuation Remeasurement Window |  |  | 1 year |  |  |
Acquisition-related costs |  |  | $ 38.9 | $ 7.4 |  | $ 6.8
Number of Reportable Segments | segment |  |  | 4 |  |  |
Goodwill |  |  | $ 3,540.0 | 2,287.1 | [1] | 2,077.6
Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  | 1.8 | 2.0 |  | 0.3
Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  | 1,211.3 | $ 134.0 |  | $ 14.0
Waterfall Holdings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,211.3 |  | 1,211.3 |  |  |
Goodwill | $ 863.3 |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | 95.8 |  |  |
eBuilder [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 485.2 | 485.2 |  |  |
Acquisition-related costs |  |  | 18.6 |  |  |
Goodwill |  | $ 392.2 |  |  |  |
Viewpoint and e-Builder [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  | 125.2 |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  | 17.3 |  |  |
Cash and Cash Equivalents [Member] | Viewpoint and e-Builder [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | 211.2 |  |  |
General and Administrative Expense [Member] | Waterfall Holdings [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related costs |  |  | $ 19.0 |  |  |
[1] | See Note 2 for a summary of adjustments

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