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Accounting Policies and Basis of Presentation - Narrative (Details) $ in Millions |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 17, 2017 | Sep. 30, 2018 USD ($) segment | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Number of reportable segments | segment |  | 3 |  |
Stockholders' equity reverse stock split, conversion ratio | 0.25 |  |  |
Restricted cash |  | $ 0.0 |  | $ 3.8
Restricted Cash, Current, Asset, Statement of Financial Position [Extensible List] |  | us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents |  | us-gaap:CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents
Other current assets |  | $ 55.6 |  | $ 56.5
Property, plant and equipment, net |  | $ 283.9 |  | $ 303.7
Restatement Adjustment |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Other current assets |  |  | $ (8.8) |
Property, plant and equipment, net |  |  | $ 8.8 |

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