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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Unrecognized Tax Benefits |  |  |  |
Unrecognized tax benefits at the beginning of period | $ 23.5 | $ 37.6 | $ 21.7 | $ 24.9
Gross increases - current year tax positions | 13.9 | 1.4 | 1.6 | 2.2
Gross increases - prior year tax positions | 1.0 | 1.1 | 0.7 | 0.5
Gross increases - acquisitions | 0.0 | 0.0 | 0.0 | 2.3
Gross decreases - prior year tax positions | (0.1) | (2.8) | 0.0 | (0.1)
Gross decreases - settlements | 0.0 | (5.1) | 0.0 | (2.7)
Gross decreases - statute lapse | (0.7) | (0.1) | (0.5) | (5.4)
Unrecognized tax benefits at end of year | 37.6 | 32.1 | 23.5 | 21.7
Interest and penalties in year-end balance | $ 2.2 | $ 3.3 | $ 1.4 | $ 0.8

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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=123427490&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=121826272&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=121826272&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=121826272&loc=SL6600010-109319 + Details
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