Debt (Tables)

12 Months Ended

Dec. 31, 2022

Debt Disclosure [Abstract]

Consolidated Debt

Debt

Long-term debt at December 31, 2021 and 2022 was as follows (in millions): 

	December 31,
	2021		2022
Commercial paper	$	108.0	$	32.0
3.20% Notes due 2025	250.0		250.0
5.00% Notes due 2026	650.0		650.0
3.25% Notes due 2030	500.0		500.0
6.40% Notes due 2037	250.0		250.0
4.20% Notes due 2042	250.0		250.0
5.15% Notes due 2043	550.0		550.0
4.20% Notes due 2045	250.0		250.0
4.25% Notes due 2046	500.0		500.0
4.20% Notes due 2047	500.0		500.0
4.85% Notes due 2049	500.0		500.0
3.95% Notes due 2050	800.0		800.0
Face value of long-term debt	5,108.0		5,032.0
Unamortized debt issuance costs(1)	(37.8)		(35.3)
Net unamortized debt premium(1)	18.6		18.3
Long-term debt, net	$	5,088.8	$	5,015.0

(1)    Debt issuance costs and note discounts and premiums are being amortized or accreted to the applicable notes over the respective lives of those notes.