CASH AND CASH EQUIVALENTS DISCONTINUED OPERATIONS (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Significant noncash transactions
Net unrealized losses on energy contracts	$ (27.9)	$ (17.3)
Deferred income taxes and investment tax credits	53.5	131.7
Discontinued operations
Significant noncash transactions
Net unrealized losses on energy contracts	0	(1.5)
Deferred income taxes and investment tax credits	0.4	6.0
Remeasurement of uncertain tax positions included in our liability for unrecognized tax benefits	$ 0	$ (5.8)