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Commitments and Contingencies - Narrative (Details)
$ in Millions
 9 Months Ended 24 Months Ended 45 Months Ended
Sep. 23, 2015
case
Sep. 30, 2015
USD ($)
case
Dec. 31, 2014
USD ($)
case
Sep. 30, 2015
USD ($)
case
Loss contingency        
Accrued liability for the outcomes of non-income based tax audits   $ 5.2 $ 9.2 $ 5.2
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   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 heavy equipment statutes appellate cases with favorable ruling | case 2      
Number of heavy equipment statutes cases pending in courts | case   2   2
Ad valorem tax benefit   $ 11.4   $ 38.3
Ad valorem tax benefit agreed to by a number of appraisal review boards and county appraisal districts   10.2   10.2
Ad valorem tax benefit in litigation   28.1   28.1
Maximum        
Business acquisition, contingent consideration        
Contingent payments   $ 46.0   $ 46.0