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Income Taxes (Activity For Unrecognized Gross Tax Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Unrecognized Gross Tax Benefits      
Balance at beginning of year $ 33.5 $ 31.2 $ 20.9
Acquired balances 86.9 0.0 0.0
Additions based on tax positions related to the current year 4.6 9.2 9.0
Additions for tax positions of prior years 13.7 3.4 5.3
Reductions for tax positions of prior years (0.4) (6.9) (0.6)
Lapse of statute (1.6) (3.3) (3.4)
Settlements 0.0 (0.1) 0.0
Balance at end of year $ 136.7 $ 33.5 $ 31.2