LONG-TERM OBLIGATIONS - Fair Value of Debt (Details) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($) $ / shares
Senior Notes \| 5-5/8% Notes
Debt Instrument [Line Items]
Book Value	$ 600.0
Quotes \| $ / shares	$ 1.04500
Senior Notes \| 5-5/8% Notes \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Fair Value	$ 627.0
Line of Credit \| Secured Debt \| 2017 Credit Agreement Term Loan (net of discount)
Debt Instrument [Line Items]
Book Value	$ 396.0
Quotes \| $ / shares	$ 1.00406
Line of Credit \| Secured Debt \| 2017 Credit Agreement Term Loan (net of discount) \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Fair Value	$ 398.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

Price at which a dealer is willing to buy an instrument, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: 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 2: 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

Reference 3: 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

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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.

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