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DEBT (Details) € in Millions, $ in Millions					6 Months Ended
	Jun. 25, 2021 USD ($)	Dec. 21, 2020 USD ($) subsidiary	Jul. 01, 2020 USD ($)	Mar. 22, 2018 USD ($)	Jun. 30, 2021 USD ($) subsidiary	Jul. 01, 2021 EUR (€)	Jun. 30, 2021 EUR (€) subsidiary	Dec. 31, 2020 USD ($)	Dec. 15, 2020 USD ($)	Jul. 01, 2020 EUR (€)	Jan. 12, 2017 USD ($)
Debt Instrument
Repayments of outstanding indebtedness					$ 20.0
Proceeds from long-term debt					110.0
Borrowings outstanding					$ 1,298.5			$ 1,203.9
Term Loan Agreement
Debt Instrument
Repayments of outstanding indebtedness				$ 300.0
Debt instrument face amount				$ 300.0
Up-front fee (as percent)				0.05
Indebtedness subsidiaries may incur				$ 250.0
Consolidated EBITDA (Percentage)				35.00%
Minimum consolidated interest ratio					4.00
Maximum consolidated leverage ratio				3.50	3.50		3.50
Borrowings outstanding					$ 159.3			$ 68.7
Term Loan Agreement | LIBOR | Minimum
Debt Instrument
Interest rate margin (as a percent)					1.00%
Term Loan Agreement | LIBOR | Maximum
Debt Instrument
Interest rate margin (as a percent)					1.50%
Term Loan Agreement | Prime Rate | Minimum
Debt Instrument
Interest rate margin (as a percent)					0.00%
Term Loan Agreement | Prime Rate | Maximum
Debt Instrument
Interest rate margin (as a percent)					0.50%
Amended term loan agreement
Debt Instrument
Proceeds from long-term debt	$ 110.0
Applicable margin on loans	0.65
Indebtedness subsidiaries may incur	$ 350.0
Consolidated EBITDA (Percentage)	35.00%
Maximum consolidated leverage ratio	4.00
3.650% Senior Notes
Debt Instrument
Debt instrument face amount					$ 650.0						$ 650.0
Interest rate (as a percent)					3.65%		3.65%	3.65%	3.65%		3.65%
Redemption price					101.00%
Borrowings outstanding					$ 646.3			$ 645.9
Revolving Credit Agreement
Debt Instrument
Minimum consolidated interest ratio					4.00
Maximum consolidated leverage ratio					3.50		3.50
Credit facility, maximum borrowing capacity		$ 250.0			$ 250.0
Term of facility		3 years
Maximum borrowing capacity, increase limit		$ 100.0
Maximum borrowing capacity, total with increase		$ 350.0
Number of subsidiaries designated as additional borrowers | subsidiary					0		0
Borrowings outstanding					$ 0.0
Revolving Credit Agreement | Minimum
Debt Instrument
Number of subsidiaries that may be designated as additional borrowers | subsidiary		1
Revolving Credit Agreement | Maximum
Debt Instrument
Minimum consolidated interest ratio					4.00
Revolving Credit Agreement | LIBOR | Minimum
Debt Instrument
Interest rate margin (as a percent)					0.875%
Revolving Credit Agreement | LIBOR | Maximum
Debt Instrument
Interest rate margin (as a percent)					1.50%
Revolving Credit Agreement | Prime Rate | Minimum
Debt Instrument
Interest rate margin (as a percent)					0.00%
Revolving Credit Agreement | Prime Rate | Maximum
Debt Instrument
Interest rate margin (as a percent)					0.50%
Revolving Credit Agreement | Line of Credit
Debt Instrument
Credit facility, maximum borrowing capacity		$ 25.0
1.625% Senior Notes
Debt Instrument
Debt instrument face amount					$ 500.0				$ 500.0
Interest rate (as a percent)					1.625%		1.625%	1.625%	1.625%
Borrowings outstanding					$ 492.9			$ 489.3
Credit Facility
Debt Instrument
Debt instrument face amount | €										€ 1,500
Maximum borrowing capacity, increase limit | €										500
Maximum borrowing capacity, total with increase | €										2,000
Borrowings outstanding | €							€ 0
Borrowing capacity available | €							€ 1,500
Debt instrument, threshold amount transferred to provider of settlement or custody services | €										500
Percentage of commitment fee			0.30%
Facility payable			364 days
Debt instrument, threshold net worth on each drawdown			$ 1,750.0
Debt instrument, amount to meet minimum liquidity regulations | €						€ 20				€ 24
Credit Facility | Base Rate
Debt Instrument
Interest rate margin (as a percent)			1.75%
Credit Facility | Federal Funds Effective Rate
Debt Instrument
Interest rate margin (as a percent)			0.50%

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- Definition

The threshold amount to meet minimum liquidity regulations under the debt instrument covenant.

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Maximum amount of indebtedness that subsidiaries may incur per the modified term loan agreement.

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The threshold amount transferred to (or secured in favor of) any provider of settlement or custody services under the debt instrument arrangement.

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Percentage of the up-front fee that accompanies borrowing money under the debt instrument.

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Period from the date of agreement the amount borrowed becomes due and payable on termination of the arrangement.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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