Financial Instruments and Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($) $ in Millions	Sep. 26, 2025	Dec. 27, 2024
Assets:
Debt and equity securities held in rabbi trusts	$ 27.0	$ 25.4
Equity securities	9.3	12.0
Interest rate cap	0.9	5.3
Total assets, fair value	37.2	42.7
Liabilities:
Deferred compensation liabilities	27.7	22.5
Contingent consideration liabilities	43.8	17.5
Total liabilities, fair value	71.5	40.0
Level 1
Assets:
Debt and equity securities held in rabbi trusts	18.0	17.4
Equity securities	9.3	12.0
Interest rate cap	0.0	0.0
Total assets, fair value	27.3	29.4
Liabilities:
Deferred compensation liabilities	0.0	0.0
Contingent consideration liabilities	0.0	0.0
Total liabilities, fair value	0.0	0.0
Level 2
Assets:
Debt and equity securities held in rabbi trusts	9.0	8.0
Equity securities	0.0	0.0
Interest rate cap	0.9	5.3
Total assets, fair value	9.9	13.3
Liabilities:
Deferred compensation liabilities	27.7	22.5
Contingent consideration liabilities	0.0	0.0
Total liabilities, fair value	27.7	22.5
Level 3
Assets:
Debt and equity securities held in rabbi trusts	0.0	0.0
Equity securities	0.0	0.0
Interest rate cap	0.0	0.0
Total assets, fair value	0.0	0.0
Liabilities:
Deferred compensation liabilities	0.0	0.0
Contingent consideration liabilities	43.8	17.5
Total liabilities, fair value	$ 43.8	$ 17.5