Retirement Plans (Schedule of Benefit Obligation, Plan Assets and Funded Status of Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 25, 2020	Dec. 27, 2019
Pension Benefits
Change in benefit obligations:
Projected benefit obligations at beginning of year	$ 29.4	$ 27.0
Service cost	0.2	0.2	$ 0.1
Interest cost	0.3	0.5	0.7
Actuarial (gain) loss	(0.9)	1.8
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(0.7)	(1.5)
Plan settlements	0.0	(0.1)
Currency translation	(1.0)	1.5
Projected benefit obligations at end of year	27.3	29.4	27.0
Change in plan assets:
Employer contributions	0.7	1.6
Postretirement Benefits
Change in benefit obligations:
Projected benefit obligations at beginning of year	40.1	40.5
Service cost	0.0	0.0	0.0
Interest cost	0.7	1.2	1.6
Actuarial (gain) loss	(1.7)	1.2
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(1.8)	(2.8)
Plan settlements	0.0	0.0
Currency translation	0.0	0.0
Projected benefit obligations at end of year	$ 37.3	$ 40.1	$ 40.5