Income Taxes (Reconciliation Of Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 48.6	$ 58.7	$ 53.0
Additions based on tax positions related to the current year	43.6	1.4	1.8
Additions for tax positions of prior years	65.5	17.6	9.4
Reductions for tax positions of prior years	(3.7)	(7.9)	(2.8)
Reductions due to lapse of statute of limitations	(0.9)	(3.1)	(0.7)
Reductions due to settlements with tax authorities	(15.4)	(18.0)	(2.0)
Unrecognized tax benefits, ending balance	$ 137.6	$ 48.6	$ 58.7

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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