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Fair Value Measurements (Estimated Fair Values of Company's Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 25, 2020
Dec. 26, 2019
Term loans | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument $ 265.3 $ 266.6
Term loans | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument 220.2 266.9
Senior Notes Due Two Zero Two Six [Member] [Member] | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument 230.0 230.0
Senior Notes Due Two Zero Two Six [Member] [Member] | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument 162.3 226.2
Senior secured notes due 2028 | Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument 400.0 400.0
Senior secured notes due 2028 | Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument $ 329.4 $ 426.7