Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 30, 2016	Jun. 30, 2017	Sep. 30, 2016	[1]	Mar. 01, 2017	Mar. 16, 2016	Nov. 19, 2015
November 2015 Share Repurchase Program
Equity, Class of Treasury Stock
Stock Repurchase Program, Authorized Amount							$ 500.0
Stock Repurchased During Period, Number of Shares	1,063,337	0	6,510,824
Stock Repurchased During Period, Amount	$ 74.4	$ 0.0	$ 425.6
Stock Repurchase Program, Remaining Amount Available		$ 0.0
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	5,366,741	0
Stock Repurchased During Period, Amount	$ 84.0	$ 266.0	$ 0.0
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	2,594,703	0
Stock Repurchased During Period, Amount	$ 0.0	$ 110.3	$ 0.0
Stock Repurchase Program, Remaining Amount Available		$ 889.7

[1] (1)Represents the Company's historical fiscal year ending on the last Friday in September.