Earnings Per Share (Narrative) (Details) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Earnings Per Share Narrative [Line Items]
Incremental Common Shares Attributable to Participating Nonvested Shares with Non-forfeitable Dividend Rights	0.3	0.3	0.3	0.3
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0		0	0.1
Preferred Stock, Dividend Rate, Percentage	5.417%	5.417%	5.417%	5.417%	5.417%
less than [Member]
Earnings Per Share Narrative [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		0.1