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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reconciliation of the total gross unrecognized tax benefits |  |  |
Balance, January 1 | $ 92.0 | $ 91.1 | $ 127.3
Additions based on tax positions related to current year | 24.1 | 16.8 | 16.1
Unrecognized tax benefits, decrease resulting from prior period tax positions |  | (2.4) |
Unrecognized tax benefits, increase resulting from prior period tax positions | 17.7 |  | 1.6
Reductions for closure of tax audits and settlements | (7.7) | (19.9) | (45.7)
Reductions for lapse in statute of limitations | 0.0 | (0.8) | (5.0)
Unrecognized tax benefits, increase resulting from foreign currency translation | 5.7 | 7.2 |
Unrecognized tax benefits, decrease resulting from foreign currency translation |  |  | (3.2)
Balance, December 31 | 120.4 | 92.0 | $ 91.1
Income tax penalties and interest expense | 10.4 | 6.4 |
Unrecognized tax benefits that would impact effective tax rate | 111.6 |  |
Income tax penalties and interest accrued on unrecognized tax benefits | 31.5 | $ 22.6 |
Other Current Liabilities [Member] |  |  |
Reconciliation of the total gross unrecognized tax benefits |  |  |
Balance, December 31 | $ 9.7 |  |

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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=84176650&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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