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5. Notes Payable and Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Principal components of long-term debt [Table Text Block]
The principal components of long-term debt are as follows (in millions):
December 31, 2022December 31, 2021
3.3%, Senior Notes due 2027$400.0 $— 
3.7%, Senior Notes due 2032800.0 — 
Less unamortized discounts and debt issuance costs(12.4)— 
Long-term debt less unamortized discounts and debt issuance costs1,187.6 — 
Finance leases and other debt10.6 11.0 
Less current maturities(0.5)(0.5)
Long-term debt$1,197.7 $10.5