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Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 30, 2016
Dec. 29, 2017
Sep. 30, 2016
Sep. 25, 2015
Mar. 01, 2017
Mar. 16, 2016
Nov. 19, 2015
Jan. 23, 2015
Class of Stock [Line Items]                
Preferred shares, shares authorized (in shares) 500,000,000 500,000,000 500,000,000          
Preferred shares, par value (in usd per share) $ 0.20 $ 0.20 $ 0.20          
Preferred shares, shares issued (in shares) 0 0 0          
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards $ 0.4 $ 5.1 $ 2.3 $ 17.2        
Treasury Stock, Shares, Canceled   26,500,000            
Treasury Stock, Canceled, Value   $ 5.3            
November 2015 Share Repurchase Program [Member]                
Class of Stock [Line Items]                
Stock Repurchase Program, Authorized Amount             $ 500.0  
January 2015 Repurchase Program [Member]                
Class of Stock [Line Items]                
Stock Repurchase Program, Authorized Amount               $ 300.0
March 2016 Repurchase Program [Member]                
Class of Stock [Line Items]                
Stock Repurchase Program, Authorized Amount           $ 350.0    
March 2017 Repurchase Program [Member]                
Class of Stock [Line Items]                
Stock Repurchase Program, Authorized Amount         $ 1,000.0