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Financing Arrangements, Interest Rates and Maturities (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2018
Debt Instrument [Line Items]      
Effective interest rate 5.15%    
Finance Lease, Liability $ 15,600,000 $ 16,100,000  
Debt issuance costs (3,900,000) (4,100,000)  
Total debt, finance lease obligations, and notes payable 2,163,500,000 1,693,500,000  
Less: current maturities 166,700,000 166,700,000  
Total long-term debt, finance lease obligations, and notes payable $ 1,996,800,000 1,526,800,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Debt, Weighted Average Interest Rate 1.67%    
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 $ 80,200,000 81,400,000  
Revolving Credit Facility      
Debt Instrument [Line Items]      
Revolving loan facility $ 561,600,000 75,100,000  
Term loan      
Debt Instrument [Line Items]      
Average interest rate at September 30, 2019 2.24%    
Revolving loan facility $ 985,000,000 $ 1,000,000,000.0