Subsequent Event (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	1 Months Ended					3 Months Ended	9 Months Ended
	Nov. 06, 2012	Nov. 30, 2012	Nov. 30, 2012	Nov. 06, 2012	May 31, 2012	Oct. 31, 2011	Sep. 30, 2012	Sep. 30, 2012
Subsequent Event [Abstract]
Stock repurchased and retired, shares				421,620			1,838,202	3,419,431
Stock repurchased and retired, value				$ 2.5			$ 9.5	$ 18.4
Share repurchase program, approved increase		10.0			10.5
Share repurchase program, remaining amount authorized	16.2							8.7
Share repurchase program, amount authorized			$ 40.5		$ 30.5	$ 20.0