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SEGMENT INFORMATION - Expenses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment information      
Stock-based compensation expense $ 63.4 $ 57.1 $ 52.3
Corporate and unallocated      
Segment information      
Payroll costs 203.3 174.9 156.3
Stock-based compensation expense 63.4 57.1 52.3
Professional service expenses 78.5 53.6 51.8
Insurance costs 6.1 6.0 6.0
Other operating expenses $ 42.8 $ 34.8 $ 31.7