Debt (Tables)

12 Months Ended

Dec. 31, 2022

Debt at December 31, consisted of:


	2022				2021
(millions)	Carrying Value		Fair Value		Carrying Value		Fair Value
2.45% Senior Notes due 2027 (issued: $500.0, August 2016)	$	498.2	$	457.7	$	497.7	$	517.9
2.50% Senior Notes due 2027 (issued: $500.0, March 2022)	497.5		460.3		0		0
6 5/8% Senior Notes due 2029 (issued: $300.0, March 1999)	297.5		326.8		297.2		388.2
4.00% Senior Notes due 2029 (issued: $550.0, October 2018)	546.4		527.8		545.9		621.0
3.20% Senior Notes due 2030 (issued: $500.0, March 2020)	496.9		448.6		496.5		536.3
3.00% Senior Notes due 2032 (issued: $500.0, March 2022)	495.9		438.1		0		0
6.25% Senior Notes due 2032 (issued: $400.0, November 2002)	396.4		435.4		396.2		547.9
4.35% Senior Notes due 2044 (issued: $350.0, April 2014)	346.9		298.4		346.8		428.4
3.70% Senior Notes due 2045 (issued: $400.0, January 2015)	395.7		310.2		395.6		447.1
4.125% Senior Notes due 2047 (issued: $850.0, April 2017)	842.1		716.2		841.9		1,029.3
4.20% Senior Notes due 2048 (issued: $600.0, March 2018)	590.4		507.0		590.2		741.3
3.95% Senior Notes due 2050 (issued: $500.0, March 2020)	490.9		404.9		490.8		600.0
3.70% Senior Notes due 2052 (issued: $500.0, March 2022)	493.5		386.5		0		0
Total	$	6,388.3	$	5,717.9	$	4,898.8	$	5,857.4

Aggregate Principal Payments on Debt Outstanding

Aggregate required principal payments on debt outstanding at December 31, 2022, were as follows:


(millions)	Payments
2023	$	0
2024	0
2025	0
2026	0
2027	1,000
Thereafter	5,450
Total	$	6,450

Cash Flow Hedging

Unrealized Gain (Loss) on Interest Rate Cash Flow Hedges Included in Accumulated Other Comprehensive Income

The following table shows the original gain (loss) recognized at debt issuance and the unamortized balance at December 31, 2022, on a pretax basis:


(millions)	Unrealized Gain (Loss) at Debt Issuance		Unamortized Balance at December 31, 2022
6 5/8% Senior Notes	$	(4.2)	$	(1.8)
6.25% Senior Notes	5.1		2.8
4.35% Senior Notes	(1.6)		(1.3)
3.70% Senior Notes	(12.9)		(10.8)
4.125% Senior Notes	(8.0)		(7.2)

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details