Income Taxes Income Tax Examination (Details) (Internal Revenue Service (IRS) [Member], USD $) In Millions, unless otherwise specified	Jan. 31, 2013	Dec. 31, 2012
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Deposits with IRS		$ 60.4
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	$ (42.3)

The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

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