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v3.20.4

Income Taxes - Accounting for Uncertainty in Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Beginning balance at January 1, | $ 129.9 | $ 114.2 | $ 66.8
Additions based on tax positions related to the current period | 1.5 | 5.3 | 0.5
Additions for tax positions of prior periods | 51.7 | 17.2 | 58.7
Reductions for tax positions of prior periods | (63.6) | (10.3) | (13.6)
Statute expirations | (7.9) | (0.1) | (2.9)
Settlement refund (payment) |  | 3.6 | 4.7
Settlement refund (payment) | (35.9) |  |
Ending balance ar December 31, | $ 75.7 | $ 129.9 | $ 114.2

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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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