Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

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 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended
	Mar. 31, 2014 4.625 Notes	Dec. 31, 2013 4.625 Notes	Mar. 31, 2014 4.875 Notes	Mar. 31, 2014 Level 2 Term Loan	Mar. 31, 2014 Carrying Amount Level 1 4.625 Notes	Dec. 31, 2013 Carrying Amount Level 1 4.625 Notes	Mar. 31, 2014 Carrying Amount Level 1 4.875 Notes	Dec. 31, 2013 Carrying Amount Level 1 4.875 Notes	Mar. 31, 2014 Carrying Amount Level 2 Term Loan	Dec. 31, 2013 Carrying Amount Level 2 Term Loan	Mar. 31, 2014 Fair Value Level 1 4.625 Notes	Dec. 31, 2013 Fair Value Level 1 4.625 Notes	Mar. 31, 2014 Fair Value Level 1 4.875 Notes	Dec. 31, 2013 Fair Value Level 1 4.875 Notes	Mar. 31, 2014 Fair Value Level 2 Term Loan	Dec. 31, 2013 Fair Value Level 2 Term Loan
Carrying amount and estimated fair values of debt
Interest rate (as a percent)	4.625%	4.625%	4.875%
Long-term debt					$ 688.0	$ 688.0	$ 450.0	$ 450.0	$ 194.1	$ 194.8	$ 680.3	$ 676.4	$ 441.3	$ 426.9	$ 197.7	$ 199.0
Debt issuance costs				$ 2.4