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Business Combinations (Narratives) (Details) $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 02, 2018 USD ($) | Feb. 02, 2018 USD ($) | Sep. 28, 2018 USD ($) | Sep. 29, 2017 USD ($) | [1] | Sep. 28, 2018 USD ($) acquisition | Sep. 29, 2017 USD ($) | [1] | Dec. 29, 2017 USD ($) | [2]
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of Businesses Acquired | acquisition |  |  |  |  | 5 |  |
Business Acquisition, Transaction Costs |  |  | $ 10.7 | $ (0.3) | $ 34.8 | $ 6.1 |
Goodwill |  |  | 3,548.6 |  | $ 3,548.6 |  | $ 2,287.1
Maximum |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Revenue of Business Acquiree Since Acquisition Date Percentage of Total Revenue |  |  |  |  | 3.00% |  |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase Consideration |  |  |  |  | $ 1,753.9 |  |
Goodwill |  |  | 1,280.5 |  | 1,280.5 |  |
Waterfall Holdings [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase Consideration | $ 1,211.2 |  |  |  | 1,211.2 |  |
Goodwill | $ 859.3 |  |  |  |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount |  |  | 95.8 |  | 95.8 |  |
eBuilder [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase Consideration |  | $ 485.2 |  |  | 485.2 |  |
Business Acquisition, Transaction Costs |  |  |  |  | 18.6 |  |
Goodwill |  | $ 392.9 |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  | 50.3 |  | 65.9 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  | 3.0 |  | 1.5 |  |
General and Administrative Expense [Member] | Waterfall Holdings [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Transaction Costs |  |  | $ 17.5 |  |  |  |
Cash and Cash Equivalents [Member] | eBuilder [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Purchase Consideration |  |  |  |  | $ 211.2 |  |
[1] | See Note 2 for a summary of adjustments
[2] | See Note 2 for a summary of adjustments

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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