Income Taxes (Details 1) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Change in unrecognized tax benefits
Beginning balance	$ 52.5	$ 36.8
Additions for tax positions related to the current year	3.1	2.9
Additions for tax positions of prior years	0	15.1
Reductions for tax positions of prior years	(1.1)	(0.1)
Settlements	(3.4)	(3.5)
Expiration of statute of limitations	(0.8)	(0.5)
Ending balance	$ 50.3	$ 50.7