Financial Instruments and Fair Value Measurements (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2025	Jun. 28, 2024	Jun. 27, 2025	Jun. 28, 2024	Dec. 27, 2024	Mar. 13, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative, Notional Amount						$ 860.0
Derivative, Interest Rate Cap, Premium						$ 20.0
Derivative, Cap Interest Rate						3.84%
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 4.0	$ (4.3)	$ (2.2)	$ 2.7
Interest Rate Cap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain (Loss) on Derivatives	(0.4)	(0.8)	(3.0)	1.3
Embedded Derivative Financial Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain (Loss) on Derivatives		(0.6)		5.3
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative Liability	0.0		0.0		$ 0.0
Investments, Fair Value Disclosure	26.2		26.2		25.4
Other Assets, Fair Value Disclosure	9.8		9.8		12.0
Cash Flow Hedge Derivative Instrument Assets at Fair Value	2.3		2.3		5.3
Assets, Fair Value Disclosure	38.3		38.3		42.7
Deferred Compensation Liability, Fair Value	21.1		21.1		22.5
Contingent consideration and acquired contingent liabilities	18.3		18.3		17.5
Financial and Nonfinancial Liabilities, Fair Value Disclosure	39.4		39.4		40.0
Level 3 | Other current and non-current assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Cash surrender value of life insurance	44.9		44.9		43.7
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments, Fair Value Disclosure	0.0		0.0		0.0
Other Assets, Fair Value Disclosure	0.0		0.0		0.0
Cash Flow Hedge Derivative Instrument Assets at Fair Value	0.0		0.0		0.0
Assets, Fair Value Disclosure	0.0		0.0		0.0
Deferred Compensation Liability, Fair Value	0.0		0.0		0.0
Contingent consideration and acquired contingent liabilities	18.3		18.3		17.5
Financial and Nonfinancial Liabilities, Fair Value Disclosure	18.3		18.3		17.5
Level 3 | Recurring | Contingent Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value adjustment	0.9	$ 0.7	0.8	$ 2.1
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments, Fair Value Disclosure	8.9		8.9		8.0
Other Assets, Fair Value Disclosure	0.0		0.0		0.0
Cash Flow Hedge Derivative Instrument Assets at Fair Value	2.3		2.3		5.3
Assets, Fair Value Disclosure	11.2		11.2		13.3
Deferred Compensation Liability, Fair Value	21.1		21.1		22.5
Contingent consideration and acquired contingent liabilities	0.0		0.0		0.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	21.1		21.1		22.5
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Investments, Fair Value Disclosure	17.3		17.3		17.4
Other Assets, Fair Value Disclosure	9.8		9.8		12.0
Cash Flow Hedge Derivative Instrument Assets at Fair Value	0.0		0.0		0.0
Assets, Fair Value Disclosure	27.1		27.1		29.4
Deferred Compensation Liability, Fair Value	0.0		0.0		0.0
Contingent consideration and acquired contingent liabilities	0.0		0.0		0.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0.0		0.0		0.0
Indemnification Agreement | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Restricted Cash and Cash Equivalents	$ 61.2		$ 61.2		$ 63.1