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SHORT-TERM DEBT (Details) | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 EUR (€) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 GBP (£) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 EUR (€)
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term debt, outstanding |  |  |  |  | $ 55,603,000 |  |  |  | $ 386,140,000 |
Line of credit [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Lines of credit |  |  |  |  | $ 55,603,000 |  |  |  | $ 16,392,000 |
Maximum month-end balance during the year |  | $ 55,621,000 | $ 24,722,000 |  |  |  |  |  |  |
Weighted average interest rate during the year |  | 2.41% | 4.04% |  |  |  |  |  |  |
Weighted average interest rate at December 31 |  |  |  | 2.01% | 2.01% | 2.01% |  | 5.13% | 5.13% | 5.13%
Commercial Paper [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum month-end balance during the year |  | $ 454,696,000 | $ 629,712,000 |  |  |  |  |  |  |
Weighted average interest rate during the year |  | 0.83% | 0.50% |  |  |  |  |  |  |
Weighted average interest rate at December 31 |  |  |  | 0.00% | 0.00% | 0.00% |  | 0.69% | 0.69% | 0.69%
Commercial paper |  |  |  |  | $ 0 |  |  |  | $ 369,748,000 |
Short-term debt, outstanding |  |  |  |  | 0 |  |  |  |  |
Letter of Credit [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  | 33,000,000 |  |  |  | 30,000,000 |
Letters of credit outstanding to facilitate purchase of products |  |  |  |  | 1,000,000 |  |  |  | 5,000,000 |
Unsecured Revolving Line Of Credit [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity |  |  |  |  |  |  | $ 900,000,000 |  |  |
Line of credit, outstanding |  |  |  |  |  |  |  |  | 0 |
Commitment fee percentage |  |  | 0.07% |  |  |  |  |  |  |
5-Year Unsecured Revolving Line Of Credit [Member] | Domestic Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit, maximum borrowing capacity | $ 750,000,000 |  |  |  |  |  |  |  |  |
Debt, term | 5 years |  |  |  |  |  |  |  |  |
Line of credit, higher borrowing capacity option | $ 1,100,000,000 |  |  |  |  |  |  |  |  |
Line of credit, outstanding |  |  |  |  | $ 0 |  |  |  |  |
Commitment fee percentage |  | 0.06% |  |  |  |  |  |  |  |
British Pound Revolving Credit Facility [Member] | Foreign Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  | 0.26% |  |  |  |  |  |  |  |
Basis points |  | 0.75% |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 1.22% | 1.22% | 1.22% |  |  |  |
Short-term debt, outstanding | £ |  |  |  | £ 20,000,000 |  |  |  | £ 0 |  |
Euro Revolving Credit Facility [Member] | Foreign Line of Credit [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  | 0.12% |  |  |  |  |  |  |  |
Basis points |  | 0.35% |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 0.35% | 0.35% | 0.35% |  |  |  |
Short-term debt, outstanding | € |  |  |  |  |  | € 12,500,000 |  |  |  | € 0
Uncommitted Line Of Credit [Member] | Line of credit [Member] |  |  |  |  |  |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term debt, outstanding |  |  |  |  | $ 71,000,000 |  |  |  | $ 88,000,000 |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + 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(19)(a)(3)) -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(a)(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(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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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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- Definition The carrying value as of the balance sheet date of the current portion 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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