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Other Long-Term Incentive Compensation (Details)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
performance_metric
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Legacy Long-term Cash Incentive Compensation Plans      
Share-based Compensation Arrangement by Share-based Payment Award      
Legacy long-term cash incentive compensation (benefit) expense $ (2.0) $ 11.2 $ 10.8
2011 Omnibus Long-term Incentive Plan | Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Incentive plan, vesting period 3 years    
Incentive plan, payment period subsequent to vesting period 90 days    
Incentive plan, award vesting rights, percentage 100.00%    
Awards outstanding (in shares) | shares 1.0    
Incentive plan, liability on SARs $ 4.8 9.0  
Cash Awards | 2005 Schneider National, Inc. Long-Term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Incentive plan, vesting period 5 years    
Incentive plan, liability on cash awards $ 8.6 8.6  
Incentive plan, award vesting rights, percentage 20.00%    
Cash Awards | 2011 Omnibus Long-term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Incentive plan, number of performance metrics | performance_metric 2    
Incentive plan, performance period 5 years    
Incentive plan, vesting period 3 years    
Incentive plan, payment period subsequent to vesting period 90 days    
Incentive plan, liability on cash awards $ 6.3 $ 22.7  
Cash Awards | 2011 Omnibus Long-term Incentive Plan | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Incentive plan, target percentage of awards 0.00%    
Cash Awards | 2011 Omnibus Long-term Incentive Plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Incentive plan, target percentage of awards 250.00%