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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