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Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Unrecognized tax benefits at January 1 | $ 31.9 | $ 27.7 | $ 21.8
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 10.2 | 6.7 | 8.2
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 0.0 | 0.3 | 0.0
Reductions for tax positions of prior years | 0.0 | (0.4) | 0.0
Reductions as a result of a lapse of the statute of limitations | (3.4) | (2.4) | (2.3)
Unrecognized tax benefits at December 31 | $ 38.7 | $ 31.9 | $ 27.7

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