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LEASES - Right-of-use assets (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
LEASES  
Balance, January 1, 2019 $ 20.8
Additions 28.5
Depreciation (6.1)
Disposals 0.0
Balance, December 31, 2019 $ 43.2