Revenue Recognition - Contract with Customer, Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from contracts with customers	$ 0.2	$ 0.6
Third parties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from contracts with customers	0.2	0.6
Related parties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Receivables from contracts with customers	10.7	11.3
Deferred revenue and credits	$ 1.6	$ 1.5