Share Repurchase Share Repurchase (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2010
Shareowners' Deficit [Abstract]
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 129.2
Stock Repurchase Program, Authorized Amount					150.0
Stock Repurchased During Period, Shares				3.4
Stock Repurchased During Period, Value				10.8	10.0
Treasury Stock, Shares, Retired		0.1
Stock Repurchased and Retired During Period, Shares				3.3
Treasury Stock, Retired, Amount			$ 0.3