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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregated Revenues The following table summarizes our revenues by type of service, which are explained in greater detail below.
Year Ended December 31,
Disaggregated Revenues (in millions)
202120202019
Transportation$5,166.7 $4,170.0 $4,376.6 
Logistics Management219.0 149.7 153.8 
Other223.0 233.1 216.6 
Total operating revenues$5,608.7 $4,552.8 $4,747.0 
Remaining Performance Obligations The following table provides information related to transactions and expected timing of revenue recognition for performance obligations that are fixed in nature and relate to contracts with terms greater than one year as of the date shown.
Remaining Performance Obligations (in millions)
December 31, 2021
Expected to be recognized within one year
Transportation$16.1 
Logistics Management13.1 
Expected to be recognized after one year
Transportation38.9 
Logistics Management6.9 
Total$75.0 
Contract Balances The following table provides information related to contract balances associated with our contracts with customers as of the dates shown.
Contract Balances (in millions)
December 31, 2021December 31, 2020December 31, 2019
Other current assets—Contract assets$33.8 $21.5 $17.6 
Other current liabilities—Contract liabilities3.2 0.7 —