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Discontinued Operations - Balance Sheet (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Current assets of discontinued operations      
Cash and cash equivalents $ 1.3 $ 0.8 $ 2.2
Accounts receivable, net 3.5 6.9  
Inventories 1.9 3.9  
Prepaid expenses and other current assets 0.9 1.4  
Current assets of discontinued operations 7.6 13.0  
Non-current assets of discontinued operations      
Property, plant and equipment, net 1.0 1.6  
Other 0.5 1.0  
Non-current assets of discontinued operations 1.5 2.6  
Current liabilities of discontinued operations      
Accounts payable 3.4 12.9  
Accrued expenses and other current liabilities 2.8 11.9  
Income taxes payable 0.7 0.9  
Current liabilities of discontinued operations 6.9 25.7  
Non-current liabilities of discontinued operations      
Other non-current liabilities 1.1 1.3  
Non-current liabilities of discontinued operations $ 1.1 $ 1.3