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Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract] |  |  |
Balance at beginning of period | $ 335.4 | $ 271.9 | $ 246.7
Increases as a result of tax positions taken during a prior year | 22.7 | 65.9 | 6.3
Decreases as a result of tax positions taken during a prior year | (25.8) | (10.8) | (8.1)
Settlements with taxing authorities | (8.1) | (6.5) | (0.8)
Lapse of statutes of limitation | (0.6) | (1.7) | (3.3)
Increases as a result of tax positions taken during the current year | 21.7 | 16.6 | 31.1
Balance at end of period | 345.3 | 335.4 | $ 271.9
Income Tax Contingency [Line Items] |  |  |
Unrecognized tax benefits that would impact effective tax rate | 296.4 |  |
Income tax penalties and interest accrued | 39.6 | 42.4 |
Income tax penalties and interest expense | (2.8) | $ 14.5 |
Minimum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Anticipated decrease in unrecognized tax benefits | 10.0 |  |
Maximum [Member] |  |  |
Income Tax Contingency [Line Items] |  |  |
Anticipated decrease in unrecognized tax benefits | $ 20.0 |  |

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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 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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- 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 increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period 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 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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