Quarterly Financial Information (Unaudited) (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2015
Quarterly Financial Information, Quarterly Charges and Credits, Amount Reconciling to Previously Reported Results	$ 2.1	$ 1.0	$ 1.2	$ 4.3