Income Taxes (Activity For Unrecognized Gross Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Unrecognized Gross Tax Benefits
Balance at beginning of year	$ 18.6	$ 13.4	$ 17.0
Reserves acquired	0	1.3	0
Additions based on tax positions related to the current year	18.4	5.5	1.2
Additions for tax positions of prior years	(0.8)	0.8	0.5
Reductions for tax positions of prior years	0	(1.4)	(0.3)
Lapse of statute	(1.2)	(1.0)	(5.0)
Settlements	(0.2)	0	0
Balance at end of year	$ 34.8	$ 18.6	$ 13.4