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Investments in and Advances to Unconsolidated Affiliates - Unconsolidated Affiliates - Additional Information (Details) - Equity Method Investee - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]        
Related party revenue $ 0.2 $ 0.3 $ 0.7 $ 0.8
Expenses, related party $ 0.3 $ 0.4 $ 1.0 $ 1.3