Fair Value Measurements (Additional Fair Value Information Relating To The Company's Financial Instruments Outstanding) (Details) - USD ($) $ in Millions	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016	Jan. 02, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 358.5	$ 216.1	$ 116.0	$ 148.0
Cash and Cash Equivalents, Fair Value Disclosure	26.8	22.2
Long-term debt	785.5	489.6
Credit Facility Outstanding	913.9	619.9
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Principal amount	400.0	400.0
Notes Payable, Fair Value Disclosure	430.4	410.6
Revolving Credit Facility [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	389.0	94.0
Long-term debt		94.0
Credit Facility Outstanding	389.0
Promissory Notes And Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit Facility Outstanding	1.2	0.8
Promissory Notes And Other [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit Facility Outstanding	1.2	0.8
Debt Instrument, Fair Value Disclosure	1.2	0.8
Uncommitted Facilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Credit Facility Outstanding	128.0	130.0
Uncommitted Facilities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term Debt	128.0	130.0
Short-term Debt, Fair Value	$ 128.0	$ 130.0