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.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

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Balance Type:	na
Period Type:	instant

- 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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-Publisher FASB
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-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

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-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-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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Balance Type:	credit
Period Type:	instant

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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Balance Type:
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- Details

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Data Type:	na
Balance Type:
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- Details

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Data Type:	na
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- Details

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LONG-TERM OBLIGATIONS - Fair Value of Debt (Details) $ in Millions	Sep. 30, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($)
Senior Notes \| 5-5/8% Notes
Debt Instrument [Line Items]
Book Value	$ 600.0
Senior Notes \| 5-5/8% Notes \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Fair Value	594.0
Line of Credit \| Secured Debt \| 2017 Credit Agreement Term Loan (net of discount)
Debt Instrument [Line Items]
Book Value	392.4	$ 395.1
Line of Credit \| Secured Debt \| 2017 Credit Agreement Term Loan (net of discount) \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Fair Value	$ 395.0
Measurement Input, Quoted Price \| Senior Notes \| 5-5/8% Notes
Debt Instrument [Line Items]
Quotes \| $ / shares	0.99000
Measurement Input, Quoted Price \| Line of Credit \| Secured Debt \| 2017 Credit Agreement Term Loan (net of discount)
Debt Instrument [Line Items]
Quotes \| $ / shares	1.00668