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Commitments and Contingencies (Details 2) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 24 Months Ended | 36 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 case | Dec. 31, 2014 | Oct. 09, 2014 case | Dec. 31, 2013
Loss contingency |  |  |  |  |
Accrued liability for the outcomes of non-income based tax audits | $ 9.2 us-gaap_LossContingencyAccrualAtCarryingValue | $ 9.2 us-gaap_LossContingencyAccrualAtCarryingValue | $ 9.2 us-gaap_LossContingencyAccrualAtCarryingValue |  | $ 16.1 us-gaap_LossContingencyAccrualAtCarryingValue
Litigation and Claims |  |  |  |  |
Number of heavy equipment statutes cases tried and completed in Texas state district court |  | 3 exh_NumberOfHeavyEquipmentStatuesCasesTriedAndCompletedToWhichEntityIsParty |  |  |
Number of heavy equipment statues cases appealed |  | 3 exh_NumberOfHeavyEquipmentStatuesCasesAppealed |  |  |
Number of district court rulings for which oral arguments were made |  |  |  | 2 exh_NumberOfDistrictCourtRulingsForWhichOralArgumentsMade |
Ad valorem tax benefit | 12.1 exh_AdValoremTaxExpenseBenefit |  | 26.9 exh_AdValoremTaxExpenseBenefit |  |
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts | 6.2 exh_AdValoremTaxExpenseBenefitApproved | 6.2 exh_AdValoremTaxExpenseBenefitApproved | 6.2 exh_AdValoremTaxExpenseBenefitApproved |  |
Ad valorem tax benefit in litigation | 20.7 exh_AdValoremTaxExpenseBenefitInLitigation | 20.7 exh_AdValoremTaxExpenseBenefitInLitigation | 20.7 exh_AdValoremTaxExpenseBenefitInLitigation |  |
Maximum |  |  |  |  |
Business acquisition, contingent consideration |  |  |  |  |
Contingent payments | $ 46 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 46 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember | $ 46 us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

X
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- Definition Represents the number of heavy equipment statutes cases tried and completed to which the entity is a party, which have been appealed. + References No definition available. + Details
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