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Income Taxes (Schedule Of Income Tax Provision) (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
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before provision for income taxes | $ 116.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 115.3 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 109.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 80.0 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 103.5 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 102.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 97.4 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 95.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 420.9 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 398.2 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ 343.1 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Current provision for income taxes, Federal |  |  |  |  |  |  |  |  | 90.9 us-gaap_CurrentFederalTaxExpenseBenefit | 128.4 us-gaap_CurrentFederalTaxExpenseBenefit | 94.9 us-gaap_CurrentFederalTaxExpenseBenefit
Current provision for income taxes, State |  |  |  |  |  |  |  |  | 7.3 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 7.4 us-gaap_CurrentStateAndLocalTaxExpenseBenefit | 3.5 us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Current provision for income taxes |  |  |  |  |  |  |  |  | 98.2 us-gaap_CurrentIncomeTaxExpenseBenefit | 135.8 us-gaap_CurrentIncomeTaxExpenseBenefit | 98.4 us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred provision for income taxes, Federal |  |  |  |  |  |  |  |  | 52.0 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 8.7 us-gaap_DeferredFederalIncomeTaxExpenseBenefit | 23.6 us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Deferred provision for income taxes, State |  |  |  |  |  |  |  |  | 4.1 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 0.1 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit | 1.4 us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred provision for income taxes |  |  |  |  |  |  |  |  | 56.1 us-gaap_DeferredIncomeTaxExpenseBenefit | 8.8 us-gaap_DeferredIncomeTaxExpenseBenefit | 25.0 us-gaap_DeferredIncomeTaxExpenseBenefit
Interest |  |  |  |  |  |  |  |  | 0.4 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 0.5 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 0 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
Unrecognized Tax Benefits, Income Tax Penalties Expense |  |  |  |  |  |  |  |  | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense
Interest and penalties expense (benefit) |  |  |  |  |  |  |  |  | 0.4 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 0.5 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Provision for income taxes | $ 43.4 us-gaap_IncomeTaxExpenseBenefit | $ 41.3 us-gaap_IncomeTaxExpenseBenefit | $ 39.8 us-gaap_IncomeTaxExpenseBenefit | $ 30.2 us-gaap_IncomeTaxExpenseBenefit | $ 37.6 us-gaap_IncomeTaxExpenseBenefit | $ 37.1 us-gaap_IncomeTaxExpenseBenefit | $ 35.9 us-gaap_IncomeTaxExpenseBenefit | $ 34.5 us-gaap_IncomeTaxExpenseBenefit | $ 154.7 us-gaap_IncomeTaxExpenseBenefit | $ 145.1 us-gaap_IncomeTaxExpenseBenefit | $ 123.4 us-gaap_IncomeTaxExpenseBenefit

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