(Schedule of Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Dec. 31, 2021	Dec. 25, 2020
Assets:
Debt and equity securities held in rabbi trusts	$ 38.7	$ 33.0
Other Assets, Fair Value Disclosure	36.5	31.1
Total assets at fair value	75.2	64.1
Liabilities:
Deferred compensation liabilities	36.9	38.0
Contingent consideration	27.3	34.7
Total liabilities at fair value	64.2	72.7
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Debt and equity securities held in rabbi trusts	24.9	23.5
Other Assets, Fair Value Disclosure	36.5	31.1
Total assets at fair value	61.4	54.6
Liabilities:
Deferred compensation liabilities	0.0	0.0
Contingent consideration	0.0	0.0
Total liabilities at fair value	0.0	0.0
Significant Other Observable Inputs (Level 2)
Assets:
Debt and equity securities held in rabbi trusts	13.8	9.5
Other Assets, Fair Value Disclosure	0.0	0.0
Total assets at fair value	13.8	9.5
Liabilities:
Deferred compensation liabilities	36.9	38.0
Contingent consideration	0.0	0.0
Total liabilities at fair value	36.9	38.0
Significant Unobservable Inputs (Level 3)
Assets:
Debt and equity securities held in rabbi trusts	0.0	0.0
Other Assets, Fair Value Disclosure	0.0	0.0
Total assets at fair value	0.0	0.0
Liabilities:
Deferred compensation liabilities	0.0	0.0
Contingent consideration	27.3	34.7
Total liabilities at fair value	$ 27.3	$ 34.7