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Debt - Summary of Carrying Amounts and Estimated Fair Values of Long-Term Borrowings (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term borrowings |  | $ 222.2 | $ 277.7
Current portion of long-term borrowings and capital lease obligations |  | 0.3 | 0.3
Notional Amount |  |  |
Debt Instrument [Line Items] |  |  |
Long-term borrowings | [1] | 222.2 | 277.7
Fair Value |  |  |
Debt Instrument [Line Items] |  |  |
Long-term borrowings | [1] | $ 222.2 | $ 277.7
[1] | Long-term borrowings includes current portions of long-term debt and current portions of capital lease obligations of $0.3 million and $0.3 million as of September 30, 2018 and December 31, 2017, respectively.

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- Definition Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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