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BASIS OF PREPARATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. (New Accounting Guidance) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease liabilities $ 146.3    
Operating lease assets $ 110.8    
ASU 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Operating lease assets, including deferred rent liabilities reclassified   $ 168.7  
Operating lease liabilities   168.7  
Deferred rent liabilities     $ 27.7
Operating lease assets   $ 141.0