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Financing Agreement - Debt Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 31, 2018
Debt Instrument [Line Items]        
Long-term debt $ 1,726.0 $ 1,365.0 $ 1,600.1  
Weighted-average interest rate as of December 31 1.77% 2.30% 3.29%  
Debt issuance costs $ (7.1) $ (5.5)    
Present value of lease payments 13.5      
Total debt, finance lease obligations, and notes payable 1,800.7 1,450.7    
Less: current maturities 553.3 142.1    
Total long-term debt, finance lease obligations, and notes payable $ 1,247.4 1,308.6    
Term Loan, 364 Day [Member]        
Debt Instrument [Line Items]        
Interest rate at period end 0.98%      
Line of Credit, Current $ 500.0      
Revolving loan facility        
Debt Instrument [Line Items]        
Average interest rate 0.00%      
Long-term debt $ 0.0 0.0    
Senior Notes | Senior Unsecured Notes, 4.60 Percent, Due May 2021        
Debt Instrument [Line Items]        
Long-term debt $ 0.0 75.0    
Interest rate, stated percentage 0.00%      
Senior Notes | Senior Unsecured Notes 4.23 Percent, Due July 2028        
Debt Instrument [Line Items]        
Long-term debt $ 350.0 350.0   $ 350.0
Interest rate, stated percentage 4.23%      
Finance lease obligations        
Debt Instrument [Line Items]        
Weighted-average interest rate as of December 31 5.20%      
Present value of lease payments $ 13.5 16.2    
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 $ 68.3 75.0    
Long-term Debt        
Debt Instrument [Line Items]        
Interest rate at period end 1.23%      
Long-term line of credit $ 876.0 $ 940.0