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Notes Payable and Long-Term Debt - Principal Components of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Long-term debt less unamortized discounts and debt issuance costs $ 1,210.1  
Less current maturities (0.5) $ (0.5)
Long-term debt 1,199.1 1,197.7
3.3%, Senior Notes due 2027    
Debt Instrument [Line Items]    
Long-term debt less unamortized discounts and debt issuance costs 395.7  
3.3%, Senior Notes due 2027 | Senior Notes    
Debt Instrument [Line Items]    
Senior notes 400.0 400.0
3.7%, Senior Notes due 2032    
Debt Instrument [Line Items]    
Long-term debt less unamortized discounts and debt issuance costs 790.5  
3.7%, Senior Notes due 2032 | Senior Notes    
Debt Instrument [Line Items]    
Senior notes 800.0 800.0
Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Less unamortized discounts and debt issuance costs (10.5) (12.4)
Long-term debt less unamortized discounts and debt issuance costs 1,189.5 1,187.6
Finance Leases and Other Debt [Member] | Finance Lease Obligations [Member]    
Debt Instrument [Line Items]    
Finance leases and other debt $ 10.1 $ 10.6