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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at January 1 | $ 857.8 | $ 350.4 | $ 217.0
Settlements with tax authorities | (111.3) | 0.0 | (3.6)
Reductions for tax positions of prior years | (80.7) | (117.9) | (20.4)
Foreign currency translation | (4.3) | (8.5) |
Foreign currency translation |  |  | 14.1
Additions based on tax positions related to the current year | 1.8 | 180.0 | 4.5
Additions for tax positions of prior years | 1.0 | 457.4 | 138.8
Lapse of statute of limitations | 0.0 | (3.6) | 0.0
Balance at December 31 | $ 664.3 | $ 857.8 | $ 350.4

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=116821951&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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