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Financing Agreement - Debt Instruments (Details)
1 Months Ended
May 26, 2020
Jul. 31, 2018
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2020
USD ($)
Apr. 09, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 02, 2018
Debt Instrument [Line Items]                
Long-term debt       $ 1,365,000,000.0   $ 1,600,100,000 $ 1,862,600,000  
Weighted-average interest rate at December 31       2.30%   3.29% 3.64%  
Debt issuance costs       $ (5,500,000)   $ (4,100,000)    
Total debt, finance lease obligations, and notes payable       1,450,700,000   1,693,500,000    
Less: current maturities       142,100,000   166,700,000    
Total long-term debt, finance lease obligations, and notes payable       1,308,600,000   1,526,800,000    
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months       $ 75,000,000        
Term Loan, 364 Day [Member]                
Debt Instrument [Line Items]                
Face amount         $ 300,000,000      
Master Notes | Senior Unsecured Notes 3.13 Percent Due December 2020                
Debt Instrument [Line Items]                
Issuance of senior notes     $ 100,000,000          
Revolving loan facility                
Debt Instrument [Line Items]                
Average interest rate       0.00%        
Long-term debt       $ 0   75,100,000    
Senior Notes | Senior Unsecured Notes, 4.60 Percent, Due May 2021                
Debt Instrument [Line Items]                
Long-term debt       $ 75,000,000.0   75,000,000.0    
Interest rate, stated percentage       4.60%        
Senior Notes | Senior Unsecured Notes 3.13 Percent Due December 2020                
Debt Instrument [Line Items]                
Long-term debt       $ 0   100,000,000.0    
Senior Notes | Senior Unsecured Notes 4.23 Percent, Due July 2028                
Debt Instrument [Line Items]                
Long-term debt   $ 350,000,000   $ 350,000,000.0   350,000,000.0    
Interest rate, stated percentage       4.23%       4.23%
Finance lease obligations                
Debt Instrument [Line Items]                
Weighted-average interest rate at December 31       5.20%        
Finance lease obligations       $ 16,200,000   16,100,000    
Notes payable and other                
Debt Instrument [Line Items]                
Interest rate, stated percentage       4.24%        
Notes payable and other | Notes Payable 3.50 Percent Due June 2027                
Debt Instrument [Line Items]                
Long-term debt       $ 75,000,000.0   81,400,000    
Long-term Debt                
Debt Instrument [Line Items]                
Interest rate at period end       1.40%        
Long-term line of credit       $ 940,000,000.0   $ 1,000,000,000.0    
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months       $ 59,000,000.0        
Revolving loan facility                
Debt Instrument [Line Items]                
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum 2.25 3.00            
Debt Instrument, Covenant, Leverage Ratio, Maximum 4.75 3.50            
Debt Instrument, Covenant, Interest Coverage Ratio, Minimum 2.25 3.00            
Debt Instrument, Covenant, Leverage Ratio, Maximum 4.75 3.50