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Fair Value Measurements - Narrative (Details) - Recurring Basis [Member] - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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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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- 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. + References No definition available. + Details
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