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Indebtedness - Senior Debt Prior Term Loan (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 19, 2017 USD ($) | Sep. 01, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Loss on amendment/refinancing of senior credit agreement |  |  | $ 900,000 | $ 1,300,000 | $ 1,400,000
Term loans | Senior Credit Facilities | Alternative base rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Description of variable rate (as a percent) |  | alternate base rate |  |  |
Term loans | Senior Credit Facilities | Federal Funds Effective Swap Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Description of variable rate (as a percent) |  | federal funds effective rate |  |  |
Basis spread on variable rate (as a percent) |  | 0.50% |  |  |
Term loans | Senior Credit Facilities | Prime Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Description of variable rate (as a percent) |  | prime rate |  |  |
Term loans | Senior Credit Facilities | One-Month LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Description of variable rate (as a percent) |  | one-month LIBOR |  |  |
Basis spread on variable rate (as a percent) |  | 1.00% |  |  |
Term loans | Senior Credit Facilities | Reserve adjusted LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Description of variable rate (as a percent) |  | reserve-adjusted LIBOR |  |  |
Term loans | Senior Credit Facilities | London Interbank Offered Rate (LIBOR), Period One |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest period which may be elected, shortest |  | 1 month |  |  |
Term loans | Senior Credit Facilities | London Interbank Offered Rate (LIBOR), Period Two |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest period which may be elected, shortest |  | 2 months |  |  |
Term loans | Senior Credit Facilities | London Interbank Offered Rate (LIBOR), Period Three |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest period which may be elected, shortest |  | 3 months |  |  |
Term loans | Senior Credit Facilities | London Interbank Offered Rate (LIBOR), Period Four |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest period which may be elected, shortest |  | 6 months |  |  |
Term loans | Purchase Card Program |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount outstanding under purchase card programs |  |  | $ 2,800,000 | $ 3,900,000 |
Senior credit facility | Senior Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted-average interest rate of senior credit facilities (as a percent) |  |  | 3.20% |  |
Maximum period within which net proceeds should be reinvested |  | 360 days |  |  |
Period after end of 360 day period if committed to be reinvested |  | 180 days |  |  |
Percentage of capital stock |  | 100.00% |  |  |
Percentage of capital stock of material first tier foreign subsidiaries |  | 65.00% |  |  |
Consolidated interest coverage ratio |  | 3.50 |  |  |
Consolidated leverage ratio | 3.50 | 3.50 |  |  |
Consolidated leverage ratio after certain permitted acquisitions | 4.00 | 4.00 |  |  |
Consolidated leverage ratio to repurchase capital stock and pay cash dividends |  | 2.75 |  |  |
Aggregate amount of repurchases and dividend declarations |  | $ 50,000,000.0 |  |  |
Additional amount for all such repurchases and dividend declarations after effective date |  | $ 100,000,000 |  |  |
Percentage of cumulative consolidated net income |  | 50.00% |  |  |
Percentage of cumulative consolidated net deficit |  | 100.00% |  |  |
Maximum borrowing capacity under financing arrangement | $ 900,000,000.0 |  |  |  |
Domestic revolving credit facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of available borrowing capacity |  |  | $ 314,300,000 |  |
Letters of credit issued, amount outstanding |  |  | 35,700,000 |  |
Maximum borrowing capacity under financing arrangement | 200,000,000.0 |  |  |  |
Letters of credit and guarantees | Senior Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fronting fees percentage |  | 0.125% |  |  |
Foreign credit instrument facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount of available borrowing capacity |  |  | 16,900,000 |  |
Letters of credit issued, amount outstanding |  |  | 183,100,000 |  |
Maximum borrowing capacity under financing arrangement | $ 150,000,000.0 |  |  |  |
Foreign credit instrument facility | Senior Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Fronting fees percentage |  | 0.25% |  |  |
Trade receivables financing arrangement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity under financing arrangement |  |  | 50,000,000.0 |  |
China, India, and South Africa | Foreign credit instrument facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity under financing arrangement |  |  | 20,200,000.0 |  |
Foreign line of credit |  |  | $ 4,200,000 |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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