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DEBT AND CREDIT FACILITIES (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Summary of the Notes
The following is a summary of the Notes as of December 31, 2020 and 2019:
 December 31,
 2020 2019
 AmountEffective
Interest Rate
 AmountEffective
Interest Rate
(in millions)(in millions)
Fixed-rate 4.300% 2018 Notes
$600.0 4.329 %$600.0 4.329 %
Unamortized discount(1.1)  (1.2) 
Unamortized debt issuance costs(3.9)(4.4)
Total carrying amount$595.0   $594.4