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Income Taxes (Details 3) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reconciliation of the beginning and ending of unrecognized tax benefits |  |  |
Balance at January 1 | $ 32.4 | $ 67.9 | $ 131.5
Additions based on tax positions related to the current period | 5.7 | 7.2 | 10.5
Additions for tax positions of prior periods | 7.3 | 36.3 | 19.5
Reductions for tax positions of prior periods | (21.8) | (13.3) | (49.9)
Statute expirations | (1.4) | (1.4) | (1.2)
Settlements | 44.6 | 64.3 | 42.5
Balance at December 31 | $ 66.8 | $ 32.4 | $ 67.9

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- Definition Amount of unrecognized tax benefits. + 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=84230637&loc=SL6600010-109319 + 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=84230637&loc=SL6600010-109319 + Details
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