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RELATED PARTIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Related Party Transaction [Line Items]      
Due from affiliates $ 681.4 $ 612.0  
Due to affiliates 146.5 171.6  
Affiliated Entity      
Related Party Transaction [Line Items]      
Operating revenues 6,302.4 $ 5,606.2 $ 5,536.3
Preferred Shares | OppenheimerFunds      
Related Party Transaction [Line Items]      
Stock consideration $ 4,000.0    
MassMutual | Preferred Shares | OppenheimerFunds      
Related Party Transaction [Line Items]      
Approximate stake help in common stock of combined firm (percent) 16.40%