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Income Taxes (Details 3) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of the beginning and ending of unrecognized tax benefits |  |  |
Balance at January 1 | $ 67.9 | $ 131.5 | $ 110.1
Additions based on tax positions related to the current period | 7.2 | 10.5 | 20.8
Additions for tax positions of prior periods | 36.3 | 19.5 | 86.1
Reductions for tax positions of prior periods | (13.3) | (49.9) | (23.4)
Statute expirations | (1.4) | (1.2) | (1.6)
Settlements | (64.3) | (42.5) | (60.5)
Balance at December 31 | $ 32.4 | $ 67.9 | $ 131.5

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