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FINANCING ARRANGEMENTS (Narrative) (Details) | Apr. 17, 2018 | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Outstanding loan balances |  | $ 0 | $ 0
Available to borrow and outstanding letters of credit |  | 237,000,000 | 217,800,000
Outstanding letters of credit |  | 132,900,000 | 134,100,000
Secured debt | Term Loan Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Debt fair value |  | $ 398,200,000 | 400,500,000
Unsecured debt | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 5.25% |
Debt fair value |  | $ 401,600,000 | 404,600,000
Unsecured debt | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes) |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate |  | 5.125% |
Debt fair value |  | $ 855,300,000 | 855,700,000
Revolving Credit Facility | Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Revolving credit facility maximum borrowing capacity |  | $ 400,000,000.0 | $ 400,000,000.0
Subsequent event | Eurodollar | Secured debt | First Amendment |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 1.75% |  |
Decrease in interest rate | 0.0025 |  |
Subsequent event | Base Rate | Secured debt | First Amendment |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 0.75% |  |
Decrease in interest rate | 0.0025 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + 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 Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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