CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Operating revenues	$ 1,163.2us-gaap_Revenues	$ 1,638.0us-gaap_Revenues
Cost of sales	577.7us-gaap_CostOfGoodsAndServicesSold	975.6us-gaap_CostOfGoodsAndServicesSold
Operating and maintenance expense	261.0us-gaap_OtherCostAndExpenseOperating	332.6us-gaap_OtherCostAndExpenseOperating
Depreciation and amortization expense	74.7	70.6
Taxes other than income taxes	25.6	26.9
Operating income	224.2us-gaap_OperatingIncomeLoss	232.3us-gaap_OperatingIncomeLoss
Earnings from equity method investments	17.5	22.9
Miscellaneous income	6.6us-gaap_OtherNonoperatingIncomeExpense	5.8us-gaap_OtherNonoperatingIncomeExpense
Interest expense	38.2us-gaap_InterestExpense	38.9us-gaap_InterestExpense
Other expense	(14.1)us-gaap_NonoperatingIncomeExpense	(10.2)us-gaap_NonoperatingIncomeExpense
Income before taxes	210.1	222.1
Provision for income taxes	78.9us-gaap_IncomeTaxExpenseBenefit	81.9us-gaap_IncomeTaxExpenseBenefit
Net income from continuing operations	131.2	140.2
Discontinued operations, net of tax	(0.9)	12.9
Net income	130.3us-gaap_ProfitLoss	153.1us-gaap_ProfitLoss
Preferred stock dividends of subsidiary	(0.8)us-gaap_DividendsPreferredStockCash	(0.8)us-gaap_DividendsPreferredStockCash
Noncontrolling interest in subsidiaries	0	0.1
Net income attributed to common shareholders	$ 129.5	$ 152.4
Average shares of common stock
Basic (in shares)	80.2	80.2
Diluted (in shares)	80.8	80.5
Earnings per common share (basic)
Net income from continuing operations (in dollars per share)	$ 1.62	$ 1.74
Discontinued operations, net of tax (in dollars per share)	$ (0.01)	$ 0.16
Earnings per common share (basic) (in dollars per share)	$ 1.61us-gaap_EarningsPerShareBasic	$ 1.90us-gaap_EarningsPerShareBasic
Earnings per common share (diluted)
Net income from continuing operations (in dollars per share)	$ 1.61	$ 1.73
Discontinued operations, net of tax (in dollars per share)	$ (0.01)	$ 0.16
Earnings per common share (diluted) (in dollars per share)	$ 1.60us-gaap_EarningsPerShareDiluted	$ 1.89us-gaap_EarningsPerShareDiluted
Dividends per common share declared (in dollars per share)	$ 0.68	$ 0.68

Aggregate dividends declared during the period for each share of common stock outstanding.

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The aggregate amount of income or expense from ancillary business-related activities (that is to say, excluding major activities considered part of the normal operations of the business).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7)

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Article 5

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The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 3

-Article 5

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- Definition

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.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 9

-Article 5

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-Name Accounting Standards Codification

-Topic 225

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-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- 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

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

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-Publisher FASB

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-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

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

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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- Definition

All taxes not related to income of the entity or excise or sales taxes levied on the revenue of the entity that are not reported elsewhere. These taxes could include production, real estate, personal property, and pump tax.

+ References

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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