Stock-Based Compensation Subsidiary Awards (Details) (USD $) In Millions, unless otherwise specified		12 Months Ended
Dec. 31, 2011	Dec. 31, 2012 Subsidiary Awards [Member]	Dec. 31, 2012 Minimum [Member] Subsidiary Awards [Member]
Award Vesting Period		4 years	3 years
Share-based Compensation Arrangement, Total Share-based Liabilities Paid	$ 17.0

The liabilities paid during the accounting period for equity-based compensation.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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