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Commitments and Contingencies (Details 2) $ in Millions | 6 Months Ended | 24 Months Ended | 30 Months Ended | 42 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) case | Jun. 30, 2015 USD ($) case | Jun. 30, 2015 USD ($) case | Feb. 12, 2015 case | Oct. 09, 2014 case
Loss contingency |  |  |  |  |  |
Accrued liability for the outcomes of non-income based tax audits | $ 9.0 | $ 9.2 | $ 9.0 | $ 9.0 |  |
Litigation and Claims |  |  |  |  |  |
Number of heavy equipment statutes cases that have advanced to the point of trial or submission of summary judgment motions | case |  |  |  | 5 |  |
Number of heavy equipment statutes cases tried and completed in Texas state district court | case |  | 3 |  |  |  |
Number of heavy equipment statutes cases appealed | case |  |  | 3 |  |  |
Number of district court appeals for which oral arguments were made | case |  |  |  |  | 1 | 2
Ad valorem tax benefit | 7.4 |  |  | $ 34.3 |  |
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts | 10.5 |  | $ 10.5 | 10.5 |  |
Ad valorem tax benefit in litigation | 23.8 |  | 23.8 | 23.8 |  |
Maximum |  |  |  |  |  |
Business acquisition, contingent consideration |  |  |  |  |  |
Contingent payments | $ 46.0 |  | $ 46.0 | $ 46.0 |  |

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