Fair Value (Tables)

6 Months Ended

Jun. 30, 2023

Fair Value Disclosures [Abstract]

Recurring Fair Value Measures [Table Text Block]

	Fair Value as of June 30, 2023
Recurring Fair Value Measures	Level 1	Level 2	Level 3	Total
Millions
Assets
Investments (a)
Available-for-sale – Equity Securities	$8.4	—	—	$8.4
Available-for-sale – Corporate and Governmental Debt Securities (b)	—	$5.7	—	5.7
Cash Equivalents	5.8	—	—	5.8
Total Fair Value of Assets	$14.2	$5.7	—	$19.9
Liabilities
Deferred Compensation (c)	—	$16.2	—	$16.2
Total Fair Value of Liabilities	—	$16.2	—	$16.2
	Fair Value as of December 31, 2022
Recurring Fair Value Measures	Level 1	Level 2	Level 3	Total
Millions
Assets
Investments (a)
Available-for-sale – Equity Securities	$7.7	—	—	$7.7
Available-for-sale – Corporate and Governmental Debt Securities	—	$5.7	—	5.7
Cash Equivalents	4.2	—	—	4.2
Total Fair Value of Assets	$11.9	$5.7	—	$17.6
Liabilities
Deferred Compensation (c)	—	$15.0	—	$15.0
Total Fair Value of Liabilities	—	$15.0	—	$15.0

(a)Included in Other Non-Current Assets on the Consolidated Balance Sheet.

(b)As of June 30, 2023, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $1.2 million, in one year to less than three years was $2.7 million, in three years to less than five years was $1.4 million and in five or more years was $0.4 million.

(c)Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.

Fair Value, by Balance Sheet Grouping [Table Text Block]

Financial Instruments	Carrying Amount	Fair Value
Millions
Short-Term and Long-Term Debt (a)
June 30, 2023	$1,801.3	$1,647.9
December 31, 2022	$1,929.1	$1,782.7

(a)Excludes unamortized debt issuance costs.