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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash Management      
Book overdrafts     $ 14.0
Goodwill      
Impairments of goodwill $ 0.0 $ 0.0