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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2024
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The principal components of long-term debt are as follows (in millions):
March 31,
2024
December 31,
2023
3.3%, Senior Notes due 2027
$400.0 $400.0 
3.7%, Senior Notes due 2032
800.0 800.0 
Less unamortized discounts and debt issuance costs(10.1)(10.5)
Long-term debt less unamortized discounts and debt issuance costs1,189.9 1,189.5 
Finance leases and other debt10.0 10.1 
Less current maturities(0.5)(0.5)
Long-term debt$1,199.4 $1,199.1