Financial Instruments and Fair Value Measurements (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2024 USD ($)	Sep. 29, 2023 USD ($)	Sep. 27, 2024 USD ($)	Sep. 29, 2023 USD ($)	Dec. 29, 2023 USD ($)	Nov. 14, 2023 USD ($)	Mar. 13, 2023 USD ($)
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)	$ (1.3)	$ 7.2	$ 1.4	$ 9.1
Other Assets, Fair Value Disclosure	30.8		30.8		$ 28.9
Cash Flow Hedge Derivative Instrument Assets at Fair Value	4.3		4.3		12.9
Assets, Fair Value Disclosure	60.0		60.0		85.1
Interest Rate Cap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain (Loss) on Derivatives	9.9	2.7	8.6	8.8
Embedded Derivative Financial Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Unrealized Gain (Loss) on Derivatives	8.0		2.7
Professional Fees Escrow Account
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Restricted Cash, Fair Value Disclosure	$ 0.0		$ 0.0			$ 24.0
Takeback Term Loans | Embedded Derivative Financial Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Discount Rate, Present Value of Future Cash Flows	1.12%		1.12%
Fourteen Point Seven Five Percent Second-Out Takeback Notes | Scenario 1 | Derivative Financial Instruments, Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative, Remaining Maturity	4 years 1 month 6 days		4 years 1 month 6 days
Fourteen Point Seven Five Percent Second-Out Takeback Notes | Scenario 1 | Derivative Financial Instruments, Liabilities | Measurement Input Probability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative Liability, Measurement Input | pURE	0.950		0.950
Fourteen Point Seven Five Percent Second-Out Takeback Notes | Embedded Derivative Financial Instruments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Discount Rate, Present Value of Future Cash Flows	2.36%		2.36%
Seven Point Five Zero Percent to Nine Point Five Zero Percent Plus SOFR First-Out Takeback Notes | Scenario 1 | Derivative Financial Instruments, Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative, Remaining Maturity	4 years 1 month 6 days		4 years 1 month 6 days
Derivative, Contract End Date			Nov. 14, 2028
Seven Point Five Zero Percent to Nine Point Five Zero Percent Plus SOFR First-Out Takeback Notes | Scenario 1 | Derivative Financial Instruments, Liabilities | Measurement Input Probability
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative Liability, Measurement Input | pURE	0.950		0.950
Fourteen Point Seven Five Percent Second-Out Takeback Notes | Scenario 1 | Derivative Financial Instruments, Liabilities | Measurement Input Coupon Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative Liability, Measurement Input | pURE	0.1475		0.1475
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative Liability	$ 12.4		$ 12.4		15.1
Investments, Fair Value Disclosure	24.9		24.9		43.3
Deferred Compensation Liability, Fair Value	21.4		21.4		21.0
Contingent consideration and acquired contingent liabilities	17.9		17.9		14.7
Financial and Nonfinancial Liabilities, Fair Value Disclosure	51.7		51.7		50.8
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	44.2		44.2		45.3
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative Liability	12.4		12.4		15.1
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	17.9		17.9		14.7
Financial and Nonfinancial Liabilities, Fair Value Disclosure	30.3		30.3		29.8
Level 3 | Recurring | Contingent Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value adjustment	1.1	$ 0.2	3.2	$ 7.3
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative Liability	0.0		0.0		0.0
Investments, Fair Value Disclosure	8.4		8.4		14.2
Other Assets, Fair Value Disclosure	0.0		0.0		0.0
Cash Flow Hedge Derivative Instrument Assets at Fair Value	4.3		4.3		12.9
Assets, Fair Value Disclosure	12.7		12.7		27.1
Deferred Compensation Liability, Fair Value	21.4		21.4		21.0
Contingent consideration and acquired contingent liabilities	0.0		0.0		0.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	21.4		21.4		21.0
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative Liability	0.0		0.0		0.0
Investments, Fair Value Disclosure	16.5		16.5		29.1
Other Assets, Fair Value Disclosure	30.8		30.8		28.9
Cash Flow Hedge Derivative Instrument Assets at Fair Value	0.0		0.0		0.0
Assets, Fair Value Disclosure	47.3		47.3		58.0
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	$ 65.5		$ 65.5		$ 80.7