Statements of Consolidated Income Statements of Consolidated Income (Parentheticals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Reclassification related to VEBA and Canadian pension plan adjustments	$ 5.7	$ 7.3	$ 4.8
Reclassification adjustments for realized gains on available for sale securities	(1.0)	0	0
Aggregate income tax expense from reclassification items	$ (1.8)	$ (2.8)	$ (1.8)