Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019	Dec. 28, 2018
Income Tax Disclosure [Abstract]
Income taxes paid	$ 44.0	$ 67.1	$ 58.1
Deferred tax assets	67.0	68.9
Deferred tax liabilities	$ 51.4	$ 40.4