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Variable Interest Entity (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Millions
12 Months Ended
Apr. 27, 2018
Dec. 31, 2018
Sep. 30, 2018
Variable Interest Entity [Line Items]      
Equity investments and advances to affiliates $ 1.8    
Net loss   $ 0.1  
Potential additional investment (up to)   1.8  
Investment in VIE     $ 1.7
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount   $ 1.8  
Present4D      
Variable Interest Entity [Line Items]      
Noncontrolling Interest, Ownership Percentage by Parent   16.50%