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INDEBTEDNESS - Schedule of Aggregate Maturities of Long-term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 17.1  
2021 17.1  
2022 17.1  
2023 17.1  
2024 381.9  
Thereafter 0.0  
Total $ 450.3 $ 465.3