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DEBT - Schedule of long-term debt (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Dec. 15, 2020	Mar. 22, 2018	Jan. 12, 2017
Debt Instrument
Total debt	$ 1,187.8	$ 1,203.9
Term Loan Agreement
Debt Instrument
Total debt	49.0	68.7
Debt instrument face amount				$ 300.0
1.625% Senior Notes
Debt Instrument
Total debt	492.7	$ 489.3
Debt instrument face amount	$ 500.0		$ 500.0
Interest rate (as a percent)	1.625%	1.625%	1.625%
3.650% Senior Notes
Debt Instrument
Total debt	$ 646.1	$ 645.9
Debt instrument face amount	$ 650.0				$ 650.0
Interest rate (as a percent)	3.65%	3.65%	3.65%		3.65%
Revolving Credit Agreement
Debt Instrument
Total debt	$ 0.0

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

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

+ References

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 470
-SubTopic 20
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