DEBT AND CREDIT FACILITIES - Summary of the Notes (Details) - Senior Notes - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Unamortized discount	$ (1.0)	$ (1.1)
Unamortized debt issuance costs	(3.3)	(3.9)
Total carrying amount	$ 595.7	595.0
Fixed-rate 4.300% 2018 Notes
Debt Instrument [Line Items]
Fixed interest rate	4.30%
Amount	$ 600.0	$ 600.0
Effective Interest Rate	4.329%	4.329%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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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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Amount, after accumulated amortization, of debt discount.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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