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Revenue Recognition - Receivables and Contract Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Accounts receivable $ 18.8   $ 17.2
Deferred revenue 8.0   5.5
Third Parties      
Disaggregation of Revenue [Line Items]      
Accounts receivable 18.8 $ 17.2  
Deferred revenue 8.0 5.5 5.5
Related Parties      
Disaggregation of Revenue [Line Items]      
Accounts receivable 21.4 18.8  
Deferred revenue $ 2.6 $ 9.4 $ 13.9