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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	$ 9.2us-gaap_LossContingencyAccrualAtCarryingValue	$ 9.2us-gaap_LossContingencyAccrualAtCarryingValue	$ 9.2us-gaap_LossContingencyAccrualAtCarryingValue		$ 16.1us-gaap_LossContingencyAccrualAtCarryingValue
Litigation and Claims
Number of heavy equipment statutes cases tried and completed in Texas state district court		3exh_NumberOfHeavyEquipmentStatuesCasesTriedAndCompletedToWhichEntityIsParty
Number of heavy equipment statues cases appealed		3exh_NumberOfHeavyEquipmentStatuesCasesAppealed
Number of district court rulings for which oral arguments were made				2exh_NumberOfDistrictCourtRulingsForWhichOralArgumentsMade
Ad valorem tax benefit	12.1exh_AdValoremTaxExpenseBenefit		26.9exh_AdValoremTaxExpenseBenefit
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts	6.2exh_AdValoremTaxExpenseBenefitApproved	6.2exh_AdValoremTaxExpenseBenefitApproved	6.2exh_AdValoremTaxExpenseBenefitApproved
Ad valorem tax benefit in litigation	20.7exh_AdValoremTaxExpenseBenefitInLitigation	20.7exh_AdValoremTaxExpenseBenefitInLitigation	20.7exh_AdValoremTaxExpenseBenefitInLitigation
Maximum
Business acquisition, contingent consideration
Contingent payments	$ 46us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 46us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 46us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

The amount of ad valorem tax expense (benefit) included as a component of cost of goods sold (excluding depreciation and amortization).

+ References

No definition available.

+ Details

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The amount of ad valorem tax expense (benefit) agreed to by one or more appraisal review boards and/or county appraisal districts.

+ References

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- Definition

The amount of ad valorem tax expense (benefit) in litigation in various courts.

+ References

No definition available.

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- Definition

Represents the number of district court rulings for which oral arguments were made.

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No definition available.

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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.

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Represents the number of heavy equipment statutes cases tried and completed to which the entity is a party.

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No definition available.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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- Definition

Amount of loss contingency liability.

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