Fair Value Measurements (Other Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Book Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior Notes	$ 250.0	$ 250.0
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior Notes	$ 214.7	$ 243.8

Fair value portion of notes payable.

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 210.5-02.19,20,22)

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

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