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Inventory (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 01, 2017
Inventory [Line Items]        
Inventory       $ 116.1
Write-downs on excess, obsolete, unmarketable or other inventory $ 41.9 $ 76.9 $ 48.2