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SEGMENT INFORMATION - Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment information        
Stock-based compensation expense $ 15.9 $ 15.6 $ 33.0 $ 30.9
Corporate and unallocated        
Segment information        
Payroll costs 56.5 50.5 111.8 100.9
Stock-based compensation expense 15.9 15.6 33.0  
Professional service expenses 17.1 18.4 33.5 35.9
Other operating expenses $ 11.8 $ 14.1 $ 23.8 $ 24.2