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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($)
Sep. 30, 2020
Apr. 09, 2020
Dec. 31, 2019
Jul. 31, 2018
Debt Instrument [Line Items]        
Effective interest rate 5.15%      
Finance Lease, Liability $ 15,800,000   $ 16,100,000  
Debt issuance costs (6,400,000)   (4,100,000)  
Total debt, finance lease obligations, and notes payable 1,864,400,000   1,693,500,000  
Less: current maturities 542,100,000   166,700,000  
Total long-term debt, finance lease obligations, and notes payable $ 1,322,300,000   1,526,800,000  
364 Day Term Loan        
Debt Instrument [Line Items]        
Average interest rate at September 30, 2020 2.75%      
Line of Credit, Current $ 300,000,000.0      
Debt face amount   $ 300,000,000    
Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt, Weighted Average Interest Rate 0.00%      
Senior Notes | Senior Unsecured Notes 4.60% Due May 2021        
Debt Instrument [Line Items]        
Stated interest rate 4.60%      
Long-term debt $ 75,000,000.0   75,000,000.0  
Senior Notes | Senior Unsecured Notes 3.13% Due December 2020        
Debt Instrument [Line Items]        
Stated interest rate 3.13%      
Long-term debt $ 100,000,000.0   100,000,000.0  
Senior Notes | Senior Unsecured Notes 4.23% Due July 2028        
Debt Instrument [Line Items]        
Stated interest rate 4.23%      
Long-term debt     350,000,000.0 $ 350,000,000.0
Notes payable and other        
Debt Instrument [Line Items]        
Stated interest rate 4.24%      
Long-term debt $ 75,000,000.0   81,400,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving loan facility $ 0   75,100,000  
Term loan        
Debt Instrument [Line Items]        
Average interest rate at September 30, 2020 1.65%      
Revolving loan facility $ 955,000,000.0   $ 1,000,000,000.0