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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Inventories (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Period prior to expiration date which triggers write-down of inventory | 6 months |  |
Period used to evaluate slow-moving inventory levels | 2 years |  |
Allowance for excess and slow moving inventory | $ 30.3 | $ 27.6 |
General and administrative costs allocated to inventory | 45.0 | 39.3 | $ 37.2
General and administrative costs included in inventory | 18.3 | 16.0 |
Finished goods inventories held on consignment | $ 106.5 | $ 88.4 |

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