Annual report pursuant to Section 13 and 15(d)

THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

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THE COMPANY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Variable Interest Entities [Abstract]    
Assets $ 261.5 $ 192.1
Liabilities 136.2 98.0
Cash and cash equivalents [Abstract]    
Client Cash $ 859.1 $ 769.4