Revenue Recognition Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction (Details) $ in Millions	Sep. 30, 2020 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Remaining Performance Obligation	$ 91.1
Expected to be recognized within one year | Transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Remaining Performance Obligation	14.9
Expected to be recognized within one year | Logistics Management
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Remaining Performance Obligation	10.9
Expected to be recognized after one year | Transportation
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Remaining Performance Obligation	52.2
Expected to be recognized after one year | Logistics Management
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction
Remaining Performance Obligation	$ 13.1