Retirement Benefit Plans Deferred Compensation Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred Compensation Liability, Current and Noncurrent	$ 12.1	$ 16.7
Deferred Compensation Arrangement With Individual, Change In Fair Value Of Underlying Assets	$ 3.3	$ (1.1)	$ 2.3