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Debt - Fair Value of Long-term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 30, 2018
Debt Disclosure [Abstract]    
Principal $ 300.0 $ 300.0
Carrying Amount 294.6 294.2
Fair Value 322.5 305.3
Unamortized debt issuance costs $ 5.4 $ 5.8