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Stockholders' Equity - Common Stock (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Sep. 12, 2017
Mar. 07, 2017
Nov. 23, 2016
Dec. 25, 2016
Dec. 31, 2017
Dec. 25, 2016
Dec. 27, 2015
Nov. 30, 2017
Sep. 22, 2015
May 31, 2014
Class of Stock [Line Items]                    
Proceeds from the issuance of common stock         $ 269.1 $ 76.2 $ 0.0      
Net proceeds used to pay-off debt         $ 269.1 14.1        
7% Senior Notes due 2019 | Senior notes                    
Class of Stock [Line Items]                    
Stated interest rate         7.00%         7.00%
Approximate amount of debt paid-off       $ 14.5 $ 435.5 $ 14.5        
Reacquisition price $ 135.5             $ 385.2 $ 175.0  
Common Stock                    
Class of Stock [Line Items]                    
Common stock sold (in shares) 16.1 11.9 13.4   28.0 13.4        
Purchase price of common stock sold (dollars per share) $ 12.25 $ 7.25 $ 6.00              
Gross proceeds from sell of stock     $ 80.5   $ 283.5