CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 395.8us-gaap_ProfitLoss	$ 393.8us-gaap_ProfitLoss	$ 385.0us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided from operating activities
Depreciation and amortization	281.4	298.6	375.2
Deferred income taxes and investment tax credits, net	177.3	125.9	143.7
Equity in earnings of unconsolidated affiliates	(172.6)	(101.9)	0
Distributions from unconsolidated affiliates	143.7	51.7	0
Allowance for equity funds used during construction	(4.2)	(6.6)	(6.2)
(Gain) Loss on disposition of assets	(0.2)us-gaap_GainLossOnDispositionOfAssets	(8.6)us-gaap_GainLossOnDispositionOfAssets	4.2us-gaap_GainLossOnDispositionOfAssets
Gain on insurance proceeds	0	0	(7.5)
Stock-based compensation	(2.7)us-gaap_ShareBasedCompensation	(3.5)us-gaap_ShareBasedCompensation	(2.6)us-gaap_ShareBasedCompensation
Regulatory assets	4.6	26.8	20.3
Regulatory liabilities	(4.4)	(32.5)	(14.8)
Other assets	(16.3)	1.3	(6.9)
Other liabilities	29.6	(7.0)	(14.3)
Change in certain current assets and liabilities
Accounts receivable, net	(9.4)	(34.0)	27.1
Accounts receivable - unconsolidated affiliates	6.8	3.7	0
Accrued unbilled revenues	3.2	(1.3)	1.9
Income taxes receivable	(10.4)	1.6	1.1
Fuel, materials and supplies inventories	20.4us-gaap_IncreaseDecreaseInInventories	5.1us-gaap_IncreaseDecreaseInInventories	13.7us-gaap_IncreaseDecreaseInInventories
Fuel clause under recoveries	(42.1)	(26.2)	1.8
Other current assets	(2.7)	(4.5)	(8.6)
Accounts payable	(64.0)	56.9	25.1
Fuel clause over recoveries	(0.4)	(108.8)	101.5
Other current liabilities	(11.8)	(7.3)	6.4
Net Cash Provided from Operating Activities	721.6	623.2	1,046.1
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures (less allowance for equity funds used during construction)	(569.3)	(990.6)	(1,150.6)
Return of capital - Equity method investments	9.5	0	0
Proceeds from sale of assets	0.7	36.3	1.5
Investment in unconsolidated affiliates	0	(2.7)	0
Acquisition of gathering assets	0	0	(78.6)
Proceeds from insurance	0	0	7.6
Reimbursement of capital expenditures	0	0	(27.5)
Net Cash Used in Investing Activities	(559.1)	(957.0)	(1,192.6)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from long-term debt	588.9	247.4	250.0
Issuance of common stock	13.2	14.2	14.3
Dividends paid on common stock	(184.1)us-gaap_PaymentsOfDividendsCommonStock	(165.5)us-gaap_PaymentsOfDividendsCommonStock	(154.5)us-gaap_PaymentsOfDividendsCommonStock
Payment of long-term debt	(240.2)us-gaap_RepaymentsOfLongTermDebt	(0.1)us-gaap_RepaymentsOfLongTermDebt	(0.1)us-gaap_RepaymentsOfLongTermDebt
(Decrease) increase in short-term debt	(341.6)	8.7	153.8
Changes in advances with unconsolidated affiliates	0	129.6	0
Contributions from noncontrolling interest partners	0	107.0	46.2
Repayment of line of credit	0	0	(150.0)
Purchase of treasury stock	0	0	(3.4)
Distributions to noncontrolling interest partners	0	(2.5)	(12.6)
Net Cash (Used in) Provided from Financing Activities	(163.8)	338.8	143.7
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(1.3)	5.0	(2.8)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	6.8	1.8	4.6
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 5.5	$ 6.8	$ 1.8

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The cash inflow from developers, builders, governmental agencies and municipalities that provide the entity with cash to extend its construction services to their properties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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Period Type:	duration

- Definition

Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows.

+ References

+ Details

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Namespace Prefix:	us-gaap_
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- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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

- Definition

The net cash inflow or outflow for borrowing having initial term of repayment 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

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Paragraph 9

-Subparagraph (c)

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

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

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-Publisher FASB

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-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

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-Subparagraph (a),(c)

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-SubTopic 10

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-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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Balance Type:	credit
Period Type:	duration

- Definition

The component of the allowance for funds used during construction during the period based on an assumed rate of return on equity funds used in financing the construction of regulated assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 835

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6501662&loc=d3e56162-110433

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 980

-SubTopic 835

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6501569&loc=d3e55921-110430

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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