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DEBT AND CREDIT FACILITIES - Summary of the Notes (Details) - Senior Notes - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Unamortized discount $ (1.1) $ (1.2)
Unamortized debt issuance costs (3.9) (4.4)
Total carrying amount $ 595.0 594.4
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%