MISCELLANEOUS INCOME (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Component Miscellaneous Income
Total miscellaneous income	$ 23.5	$ 15.7	$ 13.2
Earnings in equity-method investments
Component Miscellaneous Income
Total miscellaneous income	11.3	11.0	10.7
Equity portion of AFUDC
Component Miscellaneous Income
Total miscellaneous income	9.9	2.6	0.6
Coal transportation services
Component Miscellaneous Income
Total miscellaneous income	1.2	0.9	0.8
Key executive life insurance for retired employees
Component Miscellaneous Income
Total miscellaneous income	1.1	1.1	1.1
Other
Component Miscellaneous Income
Total miscellaneous income	$ 0	$ 0.1	$ 0

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration