Debt and Bank Credit Facilities (Details Of The Senior Notes) (Details) $ in Millions	12 Months Ended
	Dec. 29, 2018 USD ($)
Debt Instrument [Line Items]
Senior Notes	$ 400.0
Senior Notes
Debt Instrument [Line Items]
Senior Notes	400.0
Senior Notes | Fixed Rate Series 2011A Mature In July 2021
Debt Instrument [Line Items]
Senior Notes	230.0
Senior Notes | Fixed Rate Series 2011A Mature In July 2023
Debt Instrument [Line Items]
Senior Notes	$ 170.0
Minimum | Senior Notes | Fixed Rate Series 2011A Mature In July 2021
Debt Instrument [Line Items]
Stated rate, minimum	4.80%
Minimum | Senior Notes | Fixed Rate Series 2011A Mature In July 2023
Debt Instrument [Line Items]
Stated rate, minimum	4.90%
Maximum | Senior Notes | Fixed Rate Series 2011A Mature In July 2021
Debt Instrument [Line Items]
Stated rate, minimum	5.00%
Maximum | Senior Notes | Fixed Rate Series 2011A Mature In July 2023
Debt Instrument [Line Items]
Stated rate, minimum	5.10%