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Income Taxes (Summary Of Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |
Balance, beginning of year | $ 296.7 | $ 143.0
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years | (89.3) | (2.4)
Increases in unrecognized tax benefits as a result of tax positions taken during prior years | 22.4 | 1.1
Lapse of applicable statutes of limitations | (13.2) | (4.4)
Increases in unrecognized tax benefits as a result of tax positions taken during the current year | 12.8 | 17.8
Impact of foreign currency exchange rates | 9.0 | (0.3)
Settlements with taxing authorities | (0.7) | (8.0)
Increases in unrecognized tax benefits as a result of the Rowan Transaction | 0.0 | 149.9
Balance, end of year | $ 237.7 | $ 296.7

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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 settlements with taxing authorities. + 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)(3) -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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