Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - PPE, Insurance and Other (Details)

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Summary of Significant Accounting Policies - PPE, Insurance and Other (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Insurance receivables      
Insurance receivables $ 13.2 $ 11.2  
Advertising      
Advertising expense $ 1.7 $ 1.4 $ 1.7
Minimum      
Goodwill and Other Intangible Assets      
Long-term assumed annual growth rate of cash flows (in percent) 1.00%    
Maximum      
Goodwill and Other Intangible Assets      
Long-term assumed annual growth rate of cash flows (in percent) 3.00%    
Buildings and land improvements | Minimum      
Property and Equipment      
Estimated Useful Life (in years) 20 years    
Buildings and land improvements | Maximum      
Property and Equipment      
Estimated Useful Life (in years) 40 years    
Software | Minimum      
Property and Equipment      
Estimated Useful Life (in years) 3 years    
Software | Maximum      
Property and Equipment      
Estimated Useful Life (in years) 6 years    
Company vehicles | Minimum      
Property and Equipment      
Estimated Useful Life (in years) 3 years    
Company vehicles | Maximum      
Property and Equipment      
Estimated Useful Life (in years) 8 years    
Equipment | Minimum      
Property and Equipment      
Estimated Useful Life (in years) 6 years    
Equipment | Maximum      
Property and Equipment      
Estimated Useful Life (in years) 10 years