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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits, net | $ 85.1 |  |
Unrecognized tax benefits that would impact effective tax rate | 62.4 |  |
Deferred Tax Asset/Liability Related to Advanced Pricing Agreement |  |  | $ 44.0
Reconciliation of the total gross unrecognized tax benefits |  |  |
Balance, January 1 | 91.1 | $ 127.3 |
Additions based on tax positions related to current year | 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 |  | 1.6 |
Reductions for closure of tax audits and settlements | (19.9) | (45.7) |
Reductions for lapse in statute of limitations | (0.8) | (5.0) |
Unrecognized tax benefits, increase resulting from foreign currency translation | 7.2 |  |
Unrecognized tax benefits, decrease resulting from foreign currency translation |  | (3.2) |
Balance, December 31 | 92.0 | 91.1 | $ 127.3
Income tax penalties and interest expense | 6.4 | 3.2 |
Income tax penalties and interest accrued on unrecognized tax benefits | 22.6 | $ 16.0 |
Other Current Liabilities [Member] |  |  |
Reconciliation of the total gross unrecognized tax benefits |  |  |
Balance, December 31 | $ 0.8 |  |

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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 accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the 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 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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