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LEASES - Lease Costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Amortization of right-of-use assets $ 0.1 $ 0.2
Operating lease cost 13.8 39.5
Short-term lease cost 0.3 0.7
Variable lease cost 2.2 6.1
Total lease cost $ 16.4 $ 46.5