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Income Taxes - Summary of Changes in Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gross Unrecognized Tax Benefits |  |  |
Balance at beginning of period | $ 31.6 | $ 36.7 | $ 33.2
Additions (reductions) based on tax positions related to current year | 4.9 |  | 7.9
Additions (reductions) based on tax positions related to current year |  | (0.3) |
Additions based on tax positions related to prior years | 3.6 | 2.0 | 0.1
Settlements | (1.2) | (3.7) | 0.0
Statute expirations | (4.7) | (2.8) | (2.7)
Foreign currency translation | 2.2 |  |
Foreign currency translation |  | (0.3) | (1.8)
Balance at end of period | $ 36.4 | $ 31.6 | $ 36.7

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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=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 of decrease in unrecognized tax benefits resulting from foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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