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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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- Definition

Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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The number of customers with concentration risk.

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