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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, 2019 | Dec. 31, 2018
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |
Balance, beginning of year | $ 143.0 | $ 147.6
Increases in unrecognized tax benefits as a result of tax positions taken during the current year | 17.8 | 6.5
Impact of foreign currency exchange rates | (0.3) | (5.0)
Lapse of applicable statutes of limitations | (4.4) | (4.5)
Increases in unrecognized tax benefits as a result of tax positions taken during prior years | 1.1 | 2.5
Decreases in unrecognized tax benefits as a result of tax positions taken during prior years | (2.4) | (3.8)
Settlements with taxing authorities | (8.0) | (0.3)
Increases in unrecognized tax benefits as a result of Atwood acquisition | 149.9 | 0.0
Balance, end of year | $ 296.7 | $ 143.0

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