LONG-TERM OBLIGATIONS - Fair Value of Debt (Details) $ in Millions	Sep. 30, 2019 USD ($) $ / shares
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	618.0
Line of Credit \| Secured Debt \| Original Term Loan
Debt Instrument [Line Items]
Book Value	388.7
Line of Credit \| Secured Debt \| Original Term Loan \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Fair Value	390.0
Line of Credit \| Secured Debt \| 2019 Term Loan
Debt Instrument [Line Items]
Book Value	198.1
Line of Credit \| Secured Debt \| 2019 Term Loan \| Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Fair Value	$ 199.0
Measurement Input, Quoted Price \| Senior Notes \| 5-5/8% Notes
Debt Instrument [Line Items]
Quotes \| $ / shares	1.03060
Measurement Input, Quoted Price \| Line of Credit \| Secured Debt \| Original Term Loan
Debt Instrument [Line Items]
Quotes \| $ / shares	1.00333
Measurement Input, Quoted Price \| Line of Credit \| Secured Debt \| 2019 Term Loan
Debt Instrument [Line Items]
Quotes \| $ / shares	1.00583

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No definition available.

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- 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

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

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-Name Accounting Standards Codification
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-SubTopic 210
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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

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