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Related Parties - Summary of Balance Outstanding of Related Parties (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Related Party Transactions [Abstract]          
Net revenue $ 1.0 $ 3.8 $ 3.0 $ 7.6  
Operating expenses 0.1 0.6 0.7 1.0  
Interest expense 0.3 0.3 0.5 0.7  
Dividends 0.0 $ 1.4 1.1 $ 2.4  
Accounts receivable 0.8   0.8   $ 5.0
Long-term debt 25.6   25.6   28.5
Accounts payable $ 0.1   $ 0.1   $ 2.2