Consolidated Statement of Equity (Parentheticals) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]
Impact of Restatement on Opening Retained Earnings, Net of Tax	$ 51.1

Amount after tax of cumulative effect of restatement on the opening retained earnings of the earliest year presented.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22663-107794

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22658-107794

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 250

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28359718&loc=d3e22644-107794

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