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v2.4.1.9

Condensed Parent Company Financial Statements (Condensed Statements Of Income) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Operating revenues | $ 804.1 us-gaap_Revenues | $ 843.1 us-gaap_Revenues | $ 750.3 us-gaap_Revenues | $ 952.8 us-gaap_Revenues | $ 832.6 us-gaap_Revenues | $ 866.6 us-gaap_Revenues | $ 718.0 us-gaap_Revenues | $ 859.6 us-gaap_Revenues | $ 3,350.3 us-gaap_Revenues | $ 3,276.8 us-gaap_Revenues | $ 3,094.5 us-gaap_Revenues
Operating expenses |  |  |  |  |  |  |  |  | 2,806.7 us-gaap_CostsAndExpenses | 2,742.9 us-gaap_CostsAndExpenses | 2,574.8 us-gaap_CostsAndExpenses
Operating income (loss) | 91.3 us-gaap_OperatingIncomeLoss | 194.8 us-gaap_OperatingIncomeLoss | 103.3 us-gaap_OperatingIncomeLoss | 154.2 us-gaap_OperatingIncomeLoss | 108.6 us-gaap_OperatingIncomeLoss | 201.4 us-gaap_OperatingIncomeLoss | 103.2 us-gaap_OperatingIncomeLoss | 120.7 us-gaap_OperatingIncomeLoss | 543.6 us-gaap_OperatingIncomeLoss | 533.9 us-gaap_OperatingIncomeLoss | 519.7 us-gaap_OperatingIncomeLoss
Interest expense and other: |  |  |  |  |  |  |  |  |  |  |
Equity earnings from consolidated subsidiaries |  |  |  |  |  |  |  |  | (40.4)us-gaap_IncomeLossFromEquityMethodInvestments | (43.7)us-gaap_IncomeLossFromEquityMethodInvestments | (41.3)us-gaap_IncomeLossFromEquityMethodInvestments
Interest expense |  |  |  |  |  |  |  |  | 180.6 us-gaap_InterestExpense | 172.8 us-gaap_InterestExpense | 156.7 us-gaap_InterestExpense
Total interest expense and other |  |  |  |  |  |  |  |  | 103.6 us-gaap_NonoperatingIncomeExpense | 97.9 us-gaap_NonoperatingIncomeExpense | 89.5 us-gaap_NonoperatingIncomeExpense
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 440.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 436.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 430.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax benefit |  |  |  |  |  |  |  |  | 44.3 us-gaap_IncomeTaxExpenseBenefit | 53.9 us-gaap_IncomeTaxExpenseBenefit | 89.4 us-gaap_IncomeTaxExpenseBenefit
Net income |  |  |  |  |  |  |  |  | 393.3 us-gaap_NetIncomeLoss | 376.2 us-gaap_NetIncomeLoss | 335.7 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 2.0 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2.0 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2.0 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating expenses |  |  |  |  |  |  |  |  | 3.0 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.0 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.0 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Operating income (loss) |  |  |  |  |  |  |  |  | (1.0)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1.0 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense and other: |  |  |  |  |  |  |  |  |  |  |
Equity earnings from consolidated subsidiaries |  |  |  |  |  |  |  |  | (387.0)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (362.0)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (322.0)us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest expense |  |  |  |  |  |  |  |  | 9.0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11.0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 11.0 us-gaap_InterestExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest income |  |  |  |  |  |  |  |  | (2)us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2)us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4)us-gaap_InvestmentIncomeInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Total interest expense and other |  |  |  |  |  |  |  |  | (380.0)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (353.0)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (315.0)us-gaap_NonoperatingIncomeExpense / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income from continuing operations before income taxes |  |  |  |  |  |  |  |  | 379.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 354.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 316.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income tax benefit |  |  |  |  |  |  |  |  | (4.0)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4.0)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (4.0)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income |  |  |  |  |  |  |  |  | $ 383.0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 358.0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 320.0 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

X
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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