Income Taxes (Reconciliation Of Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
Reconciliation of Unrecognized Tax Benefits [Roll Forward] | |||
Balance as of January 1 | $ 206.9 | $ 187.6 | $ 231.6 |
Additions based on tax positions related to the current year | 29.6 | 20.4 | 30.5 |
Additions for tax positions of prior years | 18.5 | 2.7 | 24.9 |
Reductions for tax positions of prior years | (2.8) | (3.8) | (51.8) |
Reductions resulting from the lapse of statutes of limitations | (0.1) | 0.0 | 0.0 |
Settlements with taxing authorities | 0.0 | 0.0 | (47.6) |
Balance as of December 31 | $ 252.1 | $ 206.9 | $ 187.6 |