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Derivatives and Fair Value Measurements - Long-term debt (Details) - Successor - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Carrying Amount |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current and Long-term debt | $ 1,455.2 | $ 1,460.8
Estimated Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current and Long-term debt | $ 1,535.6 | $ 1,547.4

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