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Income Taxes (Tax Examinations) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Income Tax Examination [Line Items] |  |
Unrecognized tax benefit recognition including interest and penalties, if recognized, would effect income tax expense | $ 5.0 | $ 27.5
Tax Assessment Year 2007 to 2009 [Member] | IRS |  |
Income Tax Examination [Line Items] |  |
Tax Examination |  | 68.3
Tax Assessment Year 2007 to 2009 [Member] | Assessment related to temporary differences [Member] | IRS |  |
Income Tax Examination [Line Items] |  |
Tax Examination |  | 60.2
Tax Assessment Year 2005 to 2006 [Member] | IRS |  |
Income Tax Examination [Line Items] |  |
Tax Examination |  | 3.3
Tax Assessment Year 2005 to 2006 [Member] | Assessment related to temporary differences [Member] | IRS |  |
Income Tax Examination [Line Items] |  |
Tax Examination |  | $ 2.7

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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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