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Debt - Fair Value of Long-term Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 29, 2014
Dec. 29, 2013
Debt Disclosure [Abstract]    
Principal $ 670.2 $ 629.8
Carrying Amount 663.9 644.3
Fair Value 691.5 679.7
Long-term debt discount $ 6.3