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BASIS OF PREPARATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Variable Interest Entities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Assets $ 12,509.0 $ 10,659.0
Liabilities 2,255.3 1,390.3
Non-controlling interest 248.7 $ 0.0
VIE    
Variable Interest Entity [Line Items]    
Assets 692.7  
Liabilities 56.4  
Non-controlling interest $ 248.7