Business Combinations (Allocation of Assets and Liabilitiies) (Details) - USD ($) $ in Millions		6 Months Ended
	Feb. 02, 2018	Jun. 29, 2018	Dec. 29, 2017	[1]
Business Acquisition [Line Items]
Goodwill		$ 2,682.1	$ 2,287.1
eBuilder [Member]
Business Acquisition [Line Items]
Purchase Consideration	$ 485.2	$ 485.2
Intangible Assets Acquired	109.4
Deferred Tax Liability	(18.4)
Less fair value of all assets/liabilities acquired	92.3
Goodwill	392.9
Cash and cash equivalents	2.5
Accounts receivable	14.4
Other receivables	43.3
Other current assets	0.7
Other non-current assets	0.2
Accounts payable	(8.4)
Accrued liabilities	(39.6)
Deferred revenue liability	(11.8)
Net tangible assets acquired	1.3
Developed Product Technology [Member] | eBuilder [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired	$ 60.5
Acquired Finite-lived Intangible Assets, Estimated Useful Life	7 years
Order or Production Backlog [Member] | eBuilder [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired	$ 1.7
Acquired Finite-lived Intangible Assets, Estimated Useful Life	6 months
Customer Relationships [Member] | eBuilder [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired	$ 42.4
Acquired Finite-lived Intangible Assets, Estimated Useful Life	10 years
Trade Names [Member] | eBuilder [Member]
Business Acquisition [Line Items]
Intangible Assets Acquired	$ 4.8
Acquired Finite-lived Intangible Assets, Estimated Useful Life	7 years

[1] See Note 2 for a summary of adjustments