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FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Carrying amount
Financial instruments
Long-term debt, including current portion	$ 1,614.5	$ 1,613.5
Finance lease obligations	33.9	31.3
Fair value
Financial instruments
Long-term debt, including current portion	$ 1,858.0	$ 1,935.9

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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