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Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] |  |  |
Balance at beginning of period | $ 271.9 | $ 246.7 | $ 226.9
Increases as a result of tax positions taken during a prior year | 65.9 | 6.3 | 65.0
Decreases as a result of tax positions taken during a prior year | (10.8) | (8.1) | (47.5)
Settlements with taxing authorities | (6.5) | (0.8) | (4.6)
Lapse of statutes of limitation | (1.7) | (3.3) | (11.8)
Increases as a result of tax positions taken during the current year | 16.6 | 31.1 | 18.7
Balance at end of period | 335.4 | 271.9 | $ 246.7
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits that would impact effective tax rate | 313.5 |  |
Income tax penalties and interest accrued | 42.4 | 27.9 |
Income tax penalties and interest expense | 14.5 | $ 7.0 |
Minimum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Anticipated decrease in unrecognized tax benefits | 15.0 |  |
Maximum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Anticipated decrease in unrecognized tax benefits | $ 25.0 |  |
Foreign Tax Authority | Minimum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2019 |  |
Foreign Tax Authority | Maximum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2038 |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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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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- 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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Amount of expense 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://fasb.org/us-gaap/role/ref/legacyRef -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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