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Discontinued Operations (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 25, 2016
Dec. 29, 2013
Dec. 31, 2017
New England Media Group [Member]      
Discontinued operations      
Proceeds from the sale of discontinued operations   $ 70.0  
Net after-tax proceeds from sale, including tax benefit   $ 74.0  
Loss/(gain) on sales of disposal group $ 3.7   $ (0.7)
(Loss)/gain on sale, net of income taxes $ (2.3)   $ 0.4
Metro Boston LLC [Member]      
Discontinued operations      
Equity method investment, ownership percentage   49.00%