Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 30, 2016	Jun. 29, 2018	Dec. 29, 2017	Mar. 01, 2017	Mar. 16, 2016
March 2016 Repurchase Program
Equity, Class of Treasury Stock
Stock Repurchase Program, Authorized Amount					$ 350.0
Stock Repurchased During Period, Number of Shares	1,501,676	0	5,366,741
Stock Repurchased During Period, Amount	$ 84.0	$ 0.0	$ 266.0
Stock Repurchase Program, Remaining Amount Available		$ 0.0
March 2017 Repurchase Program
Equity, Class of Treasury Stock
Stock Repurchase Program, Authorized Amount				$ 1,000.0
Stock Repurchased During Period, Number of Shares	0	3,610,968	13,490,448
Stock Repurchased During Period, Amount	$ 0.0	$ 55.2	$ 380.6
Stock Repurchase Program, Remaining Amount Available		$ 564.2