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5. Long-Term Debt
3 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Long-term Debt .    LONG-TERM DEBT
The principal components of long-term debt are as follows (in millions):
March 31,
2023
December 31,
2022
3.3%, Senior Notes due 2027$400.0 $400.0 
3.7%, Senior Notes due 2032800.0 800.0 
Less unamortized discounts and debt issuance costs(12.0)(12.4)
Long-term debt less unamortized discounts and debt issuance costs1,188.0 1,187.6 
Finance leases and other debt10.5 10.6 
Less current maturities(0.5)(0.5)
Long-term debt$1,198.0 $1,197.7