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

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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+ 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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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Debt Summary of Long-term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2010	May. 31, 2008
Debt Instrument [Line Items]
Long-term Debt	$ 595.9	$ 594.9
Notes 2018 Term
Debt Instrument [Line Items]
Long-term Debt	$ 298.8	$ 298.3
Interest rate, stated percentage	5.95%	5.95%		5.95%
Notes 2022 Term
Debt Instrument [Line Items]
Long-term Debt	$ 297.1	$ 296.6
Interest rate, stated percentage	3.625%	3.625%	3.625%