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CHANGES IN SIGNIFICANT ACCOUNTING POLICIES - Expensed lease payments (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
CHANGES IN SIGNIFICANT ACCOUNTING POLICIES  
Lease with a term of 12 months or less $ 23.7
Leases of assets with underlying value, when new, of $5,000 or less 0.4
Leases with variable lease payments 23.3
Total lease payments that have been expensed $ 47.4