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Business Combinations (Narratives) (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 02, 2018 USD ($) | Jun. 29, 2018 USD ($) | Jun. 30, 2017 USD ($) | [1] | Jun. 29, 2018 USD ($) acquisition | Jun. 30, 2017 USD ($) | [1] | Dec. 29, 2017 USD ($) | [2]
Business Acquisition [Line Items] |  |  |  |  |  |
Number of Businesses Acquired | acquisition |  |  |  | 4 |  |
Business Acquisition, Transaction Costs |  | $ 8.1 | $ 4.3 | $ 24.1 | $ 6.4 |
Goodwill |  | 2,682.1 |  | $ 2,682.1 |  | $ 2,287.1
Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Revenue of Business Acquiree Since Acquisition Date Percentage of Total Revenue |  |  |  | 2.00% |  |
Series of Individually Immaterial Business Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase Consideration |  |  |  | $ 543.1 |  |
Goodwill |  | 421.7 |  | 421.7 |  |
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 |  | 10.6 |  | 15.6 |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  | $ 0.1 |  | (1.5) |  |
Cash and Cash Equivalents [Member] | eBuilder [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase Consideration |  |  |  | $ 200.0 |  |
[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://www.xbrl.org/2003/role/presentationRef -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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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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