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Income Taxes (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of the beginning and ending of unrecognized tax benefits |  |  |
Balance at January 1 | $ 131.5 | $ 110.1 | $ 125.9
Additions based on tax positions related to the current period | 10.5 | 20.8 | 11.9
Additions for tax positions of prior periods | 19.5 | 86.1 | 71.7
Reductions for tax positions of prior periods | (49.9) | (23.4) | (92.1)
Statute expirations | (1.2) | (1.6) | (1.9)
Settlements | (42.5) | (60.5) | (5.4)
Balance at December 31 | $ 67.9 | $ 131.5 | $ 110.1

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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 -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: 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 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period 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 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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