Summary of Significant Accounting Policies (Revenue Recognition) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Change in Accounting Estimate [Line Items]
Percent of revenue - POC Method	30.50%	31.20%	28.70%
Favorable changes in estimate	$ 27.7	$ 38.6	$ 22.9
Unfavorable changes in estimate	(29.6)	(35.5)	(25.9)
Contracts Accounted for under Percentage of Completion
Change in Accounting Estimate [Line Items]
Net change - income/(expense)	$ (1.9)	$ 3.1	$ (3.0)