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Debt (Schedule of Maturity of Debt) (Details) - USD ($)
$ in Millions
Dec. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Less than 1 Year $ 0.9  
Year 2 445.0  
Principal amounts repayable 445.9  
Debt issuance costs (4.7) $ (3.8)
Total debt $ 441.2 $ 630.9