LONG-TERM DEBT (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Schedule of long-term debt instruments

The following table is a summary of our long-term debt outstanding (excluding finance leases) as of December 31:

(in millions)	Interest Rate	Year Due	2021		2020
Senior Notes (unsecured)	3.35%	2021	$	—	$	400.0
	6.08%	2028	50.0		50.0
	5.55%	2036	125.0		125.0
	3.671%	2042	300.0		300.0
	4.752%	2044	450.0		450.0
	3.30%	2049	300.0		300.0
	2.85%	2051	450.0		—
Total			1,675.0		1,625.0
Unamortized debt issuance costs			(14.2)		(10.7)
Unamortized discount, net			(1.5)		(0.8)
Total long-term debt, including current portion (1)			1,659.3		1,613.5
Current portion of long-term debt			—		(400.0)
Total long-term debt			$	1,659.3	$	1,213.5

(1)    The amount of long-term debt on our balance sheet includes finance lease obligations of $31.3 million at both December 31, 2021 and December 31, 2020.

Schedule of future maturities of long-term debt

The following table shows the future maturities of our long-term debt outstanding (excluding obligations under finance leases) as of December 31, 2021:

(in millions)	Payments
2022	$	—
2023	—
2024	—
2025	—
2026	—
Thereafter	1,675.0
Total	$	1,675.0