Debt (Schedule of Borrowings) (Details) - USD ($) $ in Millions	Sep. 12, 2015	Jan. 03, 2015	Sep. 06, 2014
Debt Instrument [Line Items]
Long-term debt	$ 825.0	$ 900.2	$ 1,095.9
Capital lease obligations	0.6	0.6	0.7
Total debt	825.6	900.8	1,096.6
Term Loan A [Member] | July Thirteenth Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Long-term debt	450.0	525.2	720.9
Public Bonds [Member] | October Fifteen Two Thousand Twenty [Member]
Debt Instrument [Line Items]
Long-term debt	$ 375.0	$ 375.0	$ 375.0