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Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance as of January 1 | $ 280.3 | $ 316.4 | $ 328.2
Additions based on tax positions related to the current year | 10.0 | 8.5 | 10.2
Additions for tax positions of prior years | 4.3 | 2.7 | 9.6
Reductions for tax positions of prior years | (8.0) | (9.5) | (5.1)
Reductions resulting from the lapse of statutes of limitations | (5.2) | (5.5) | (0.3)
Settlements with taxing authorities | (17.3) | (32.3) | (26.2)
Balance as of December 31 | $ 264.1 | $ 280.3 | $ 316.4

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-15A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org//1943274/2147482525/740-10-45-10B + Details
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