Background and Basis of Presentation (Narrative) (Details) - $ / shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Dividends Payable [Line Items]
Dividends declared (usd per share)	$ 0.565	$ 0.52	$ 1.605	$ 1.48	$ 2.00
Annualized Dividend Rate			$ 2.26
Common Stock [Member] | Dividend Declared [Member]
Dividends Payable [Line Items]
Increase in rate of dividend	8.70%