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Income Taxes (Details 6) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |
Change to gross unrecognized tax benefits including interest and penalties | $ (20.7) | $ (10.4) | $ 11.6
Reserve released due to favorable audit | 9.4 | 11.6 |
Uncertain tax liabilities interest and penalties | (9.3) | (1.4) | 0.5
Uncertain tax liabilities interest and penalties accrued | 12.8 | 22.1 |
Unrecognized tax benefits and income tax expense possibly reduced from audit resolutions | 14.5 |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at beginning of year | 47.3 | 56.3 | 45.2
Additions based on tax positions related to the current year | 2.0 | 1.8 | 1.7
Additions for tax positions of prior years | 3.7 | 3.6 | 17.1
Reductions for tax positions of prior years | (0.2) | 0 | (1.7)
Reductions based on settlements with taxing authorities | (11.5) | (13.0) | (5.4)
Reductions for lapse of statute | (5.4) | (1.4) | (0.6)
Balance at end of year | $ 35.9 | $ 47.3 | $ 56.3

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- Definition Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities During Next Twelve Months + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References 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 + Details
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