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Summary of Significant Accounting Policies and Other Items - Significant Customers and Concentration of Credit Risk (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) customer | Dec. 31, 2018 USD ($) customer | Dec. 31, 2017 USD ($) customer
Total revenues | Customer |  |  |
Significant Customers and Concentration of Credit Risk |  |  |
Number of Customers | customer | 1 | 1 | 1
Concentration of risk (as a percent) | 10.00% | 11.00% | 11.00%
Purchases | Supplier concentration |  |  |
Significant Customers and Concentration of Credit Risk |  |  |
Concentration of risk (as a percent) | 16.00% | 21.00% | 22.00%
Purchases from the vendor | $ 36.5 | $ 46.7 | $ 33.4
Amounts due to the vendor | $ 4.3 | $ 5.0 |

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