Statements of Consolidated Income (Parentheticals) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Other comprehensive income reclassifications related to VEBA adjustments	$ 1.4		$ 1.8
Reclassification of unrealized gain upon sale of available for sale securities	0.4	[1]	0
Other comprehensive income reclassification adjustment, tax	$ (0.4)		$ (0.7)

[1] Amounts reclassified out of Accumulated other comprehensive income relating to sales of available for sale securities were included as a component of Other income, net.