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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES New Accounting Pronouncements (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease right of use assets $ 836.5 $ 306.4 $ 250.0
Operating Lease, Liability $ 834.4   $ 250.0