Other income expense Other income expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2008
Other Income and Expenses [Abstract]
Loss from disposal activities	$ 37.9	$ 0	$ 37.9	$ 0
Gain (Loss) Related to Litigation Settlement	0	(29.1)	0	(29.1)	(4.0)
Other Operating Income	(1.3)		(0.2)	(1.4)
Other Cost and Expense, Operating		0.2
Other Operating Income (Expense), Net	36.6	(28.9)	37.7	(30.5)
Litigation Settlement, Gross				32.5
Litigation Settlement, Expense				$ 3.4