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Long-term Debt - Receivables Facility (Details) - Receivables Facility [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 18, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 19, 2018
Debt Instrument [Line Items] |  |  |  |  |
Secured debt, Maximum Borrowing Capacity |  |  |  |  | $ 75.0
Debt cost, 1-month LIBOR plus |  | 1.00% | 1.00% |  |
Debt Instrument, Unused Borrowing Capacity, Fee percentage |  | 0.35% | 0.35% |  |
Receivables facility debt outstanding |  |  | $ 0.0 |  |
Receivables facility debt available but not utilized |  |  | 57.8 |  |
Receivables facililty, debt aggregate costs | $ 0.1 |  | $ 1.0 | $ 0.9 |

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- Definition Debt Instrument, Unused Borrowing Capacity, Fee percentage + References No definition available. + Details
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- Definition Debt cost, 1-month LIBOR plus + References No definition available. + Details
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- Definition Amount of the fee that accompanies borrowing money under the debt instrument. + References No definition available. + Details
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- Definition Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date. + 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 210.5-02.22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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