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Income Taxes - Reconciliation of Unrecognized Tax Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of total amounts of unrecognized income tax benefits |  |  |
Gross Unrecognized Tax Liabilities – opening balance | $ 66.5 | $ 57.0 | $ 58.8
Gross increases – tax positions in prior period | 4.8 | 12.2 | 3.6
Gross decreases – tax positions in prior period | (0.5) | (13.5) | (10.6)
Gross increases – tax positions in current period | 12.3 | 14.9 | 11.5
Gross decreases – tax positions in current period | 0.0 | 0.0 | 0.0
Settlements | (0.1) | (1.4) | (1.5)
Lapse of statute of limitations | (4.8) | (2.7) | (4.8)
Gross Unrecognized Tax Liabilities – ending balance | $ 78.2 | $ 66.5 | $ 57.0

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=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 tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + 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://www.xbrl.org/2003/role/disclosureRef -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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