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Income Taxes (Details 3) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of the beginning and ending of unrecognized tax benefits |  |  |
Balance at January 1 | $ 114.2 | $ 66.8 | $ 32.4
Additions based on tax positions related to the current period | 5.3 | 0.5 | 5.7
Additions for tax positions of prior periods | 17.2 | 58.7 | 7.3
Reductions for tax positions of prior periods | (10.3) | (13.6) | (21.8)
Statute expirations | (0.1) | (2.9) | (1.4)
Settlements | 3.6 | 4.7 | 44.6
Balance at December 31 | $ 129.9 | $ 114.2 | $ 66.8

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