XML 32 R30.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Regulatory Assets (Detail) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013
--- | --- | --- | ---
Regulatory Assets [Line Items] |  |  |  |  |  |
Regulatory Assets | $ 109.9 |  | $ 143.7 |  | $ 153.9 |
Less: Current Portion of Regulatory Assets | 24.6 | [1] | 43.6 | [1] | 33.0 | [1]
Regulatory Assets - noncurrent | 85.3 |  | 100.1 |  | 120.9 |
Environmental Matters |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |
Regulatory Assets | 10.6 |  | 16.1 |  | 16.1 |
Retirement Benefit |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |
Regulatory Assets | 42.2 |  | 42.6 |  | 62.7 |
Income Taxes |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |
Regulatory Assets | 10.1 |  | 11.9 |  | 9.3 |
Electric Utilities |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |
Regulatory Assets | 20.7 |  | 25.6 |  | 26.5 |
Other Assets |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |
Regulatory Assets | 6.6 |  | 5.7 |  | 6.8 |
Energy Supply & Other Regulatory Tracker Mechanisms |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |
Regulatory Assets | 17.6 |  | 32.5 |  | 20.9 |
Deferred Restructuring Costs |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |
Regulatory Assets | $ 2.1 |  | $ 9.3 |  | $ 11.6 |
[1] | Reflects amounts included in Accrued Revenue, discussed above, on the Company's Consolidated Balance Sheets.

X
- Details
Name: | us-gaap_RegulatoryAssetLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssetsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
Name: | us-gaap_RegulatoryAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant