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

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Debt Instrument, Covenant, Interest Coverage Ratio, Minimum

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Debt Instrument, Covenant, Interest Coverage Ratio, Minimum, Scenario One.

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Debt Instrument, Covenant, Leverage Ratio, Maximum

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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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The amount of threshold net worth on each drawdown and delivery of compliance certificates under the debt instrument covenant.

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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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Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option

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Line of Credit Facility, Accordion Feature, Increase Limit

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The number of subsidiaries designated as additional borrowers.

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The number of subsidiaries that may be designated as additional borrowers.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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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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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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DEBT (Details) € in Millions, $ in Millions								6 Months Ended
DEBT (Details) € in Millions, $ in Millions	Jun. 30, 2022 USD ($) subsidiary	May 31, 2022 USD ($)	Apr. 29, 2022 USD ($)	Mar. 29, 2022 USD ($)	Feb. 25, 2022 USD ($) subsidiary	Jun. 25, 2021 USD ($)	Jul. 01, 2020 USD ($)	Jun. 30, 2022 USD ($) subsidiary	Jun. 30, 2021 USD ($)	Jun. 30, 2022 EUR (€) subsidiary	Mar. 16, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jul. 01, 2021 EUR (€)	Dec. 15, 2020 USD ($)	Jul. 01, 2020 EUR (€)	Mar. 22, 2018 USD ($)	Jan. 12, 2017 USD ($)
Debt Instrument
Repayments of outstanding indebtedness									$ 20.0
Proceeds from long-term debt								$ 663.6	$ 110.0
Borrowings outstanding	$ 1,959.2							$ 1,959.2				$ 1,299.3
Floor Rate
Debt Instrument
Interest rate margin (as a percent)								1.00%
Dollars SFOR
Debt Instrument
Interest rate margin (as a percent)								0.10%
Sterling SONIA
Debt Instrument
Interest rate margin (as a percent)								0.0326%
Euros EURIBOR
Debt Instrument
Interest rate margin (as a percent)								0.00%
Term Loan Agreement
Debt Instrument
Debt instrument face amount																$ 300.0
Minimum consolidated interest ratio								4.00
Maximum consolidated leverage ratio	3.50							3.50		3.50
Maximum consolidated leverage ratio, scenario one	4.25							4.25		4.25
Maximum consolidated leverage ratio, scenario two	4.00							4.00		4.00
Borrowings outstanding	$ 524.6							$ 524.6				159.5
Amended term loan agreement
Debt Instrument
Proceeds from long-term debt		$ 175.0	$ 190.0	$ 400.0		$ 110.0
Amended term loan agreement \| Secured Overnight Financing Rate ("SOFR")
Debt Instrument
Interest rate margin (as a percent)				0.65%
Amended term loan agreement \| Prime Rate
Debt Instrument
Interest rate margin (as a percent)				0.50%
Senior Notes
Debt Instrument
Redemption price								101.00%
3.000% Senior Notes due March 2032
Debt Instrument
Debt instrument face amount	$ 300.0							$ 300.0			$ 300.0
Interest rate (as a percent)	3.00%							3.00%		3.00%	3.00%
Borrowings outstanding	$ 295.8							$ 295.8
1.625% Senior Notes due December 2030
Debt Instrument
Debt instrument face amount	$ 500.0							$ 500.0				$ 500.0		$ 500.0
Interest rate (as a percent)	1.625%							1.625%		1.625%	1.625%	1.625%		1.625%
Borrowings outstanding	$ 493.7							$ 493.7				$ 493.3
3.650% Senior Notes due January 2027
Debt Instrument
Debt instrument face amount	$ 650.0							$ 650.0				$ 650.0					$ 650.0
Interest rate (as a percent)	3.65%							3.65%		3.65%	3.65%	3.65%					3.65%
Borrowings outstanding	$ 646.9							$ 646.9				$ 646.5
Revolving Credit Agreement
Debt Instrument
Minimum consolidated interest ratio								4.00
Minimum consolidated interest ratio, scenario one								4.25
Minimum consolidated interest ratio, scenario two								4.00
Maximum consolidated leverage ratio	3.50							3.50		3.50
Credit facility, maximum borrowing capacity					$ 400.0
Term of facility					3 years
Maximum borrowing capacity, increase limit					$ 200.0
Maximum borrowing capacity, total with increase					$ 600.0
Number of subsidiaries designated as additional borrowers \| subsidiary	0							0		0
Borrowings outstanding	$ 0.0							$ 0.0
Borrowing capacity available	$ 400.0							$ 400.0
Revolving Credit Agreement \| Minimum
Debt Instrument
Interest rate margin (as a percent)								0.75%
Number of subsidiaries that may be designated as additional borrowers \| subsidiary					1
Revolving Credit Agreement \| Maximum
Debt Instrument
Interest rate margin (as a percent)								1.25%
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)								0.25%
Revolving Credit Agreement \| Swing Line Sub-Facility
Debt Instrument
Credit facility, maximum borrowing capacity					$ 25.0
EuroCCP \| 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 \| €										1,250
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
EuroCCP \| Credit Facility \| Minimum
Debt Instrument
Credit facility, maximum borrowing capacity \| €										1,250
Maximum borrowing capacity, total with increase \| €										1,750
Debt instrument, amount to meet minimum liquidity regulations \| €										20
EuroCCP \| Credit Facility \| Maximum
Debt Instrument
Credit facility, maximum borrowing capacity \| €										1,500
Maximum borrowing capacity, total with increase \| €										2,000
Debt instrument, amount to meet minimum liquidity regulations \| €										€ 30
EuroCCP \| Credit Facility \| Base Rate
Debt Instrument
Interest rate margin (as a percent)							1.75%
EuroCCP \| Credit Facility \| Base Rate \| Minimum
Debt Instrument
Interest rate margin (as a percent)	1.60%
EuroCCP \| Credit Facility \| Base Rate \| Maximum
Debt Instrument
Interest rate margin (as a percent)	1.75%
EuroCCP \| Credit Facility \| Federal Funds Effective Rate
Debt Instrument
Interest rate margin (as a percent)							0.50%
ErisX \| Amended term loan agreement
Debt Instrument
Proceeds from long-term debt			$ 190.0
NEO \| Amended term loan agreement
Debt Instrument
Proceeds from long-term debt		$ 175.0