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Income Taxes - Uncertain Income Tax Positions (Details) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 USD ($) jurisdiction | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Income Tax Contingency [Line Items] |  |  |  |  |  |
Number of significant foreign jurisdictions | jurisdiction |  |  |  | 11 |  |
Unrecognized tax benefits | $ 68.2 | $ 79.1 | $ 79.1 | $ 76.2 | $ 68.2 | $ 79.1
Unrecognized tax benefits that would impact effective tax rate |  |  |  | 34.6 | 29.4 |
Interest and penalties recognized | (1.5) | 1.4 | 0.9 |  |  |
Interest and penalties accrued |  |  |  | 13.9 | 15.4 |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |  |  |  |
Balance at beginning of year | 68.2 | 79.1 | 84.0 |  |  |
Increases related to positions taken in the current year | 1.1 | 4.1 | 11.8 |  |  |
Increases related to positions taken in prior years | 25.7 | 3.4 |  |  |  |
Decreases related to positions taken in prior years |  |  | (1.8) |  |  |
Decreases related to lapse of statutes of limitations | (18.8) | (13.0) | (13.5) |  |  |
Settlements during the current year | 0.0 | (2.8) | (1.4) |  |  |
Decreases for tax positions on dispositions | 0.0 | (2.6) | 0.0 |  |  |
Balance at end of year | $ 76.2 | $ 68.2 | $ 79.1 |  |  |
Offsetting non-current deferred tax asset |  |  |  | 27.4 | $ 34.0 | $ 45.3
Minimum |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Possible decrease in unrecognized tax benefits |  |  |  | 33.4 |  |
Maximum |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Possible decrease in unrecognized tax benefits |  |  |  | $ 53.1 |  |

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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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