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Related Party Transactions (Details) - Equity Method Investee - Related Party Transactions - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Related Party Transaction [Line Items]        
Revenues $ 27.6 $ 45.1 $ 57.5 $ 73.3
Costs of materials and other $ 10.9 $ 20.3 $ 31.4 $ 33.7