Basis of Presentation Equity Offering (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Common Stock, Shares Issued in Period	37,950
Proceeds from Issuance of Common Stock	$ 368.6	$ 0.0

The cash inflow from the additional capital contribution to the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration