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Fair Value Measurements - Narrative (Details) - Recurring Basis [Member] - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Inputs, Level 2 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Long-term Debt, Fair Value	$ 2,039.0	$ 1,881.0
Other Assets [Member] | Egypt, Pounds
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Assets	1.0	0.7
Other Noncurrent Assets [Member] | Angola, Kwanza
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Assets	$ 1.9	$ 1.7

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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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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of assets classified as other.

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