Fair Value (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Recurring Fair Value Measures [Table Text Block]

	Fair Value as of September 30, 2020
Recurring Fair Value Measures	Level 1	Level 2	Level 3	Total
Millions
Assets
Investments (a)
Available-for-sale – Equity Securities	$10.4	—	—	$10.4
Available-for-sale – Corporate and Governmental Debt Securities (b)	—	$10.5	—	10.5
Cash Equivalents	1.3	—	—	1.3
Total Fair Value of Assets	$11.7	$10.5	—	$22.2
Liabilities
Deferred Compensation (c)	—	$21.3	—	$21.3
Total Fair Value of Liabilities	—	$21.3	—	$21.3
Total Net Fair Value of Assets (Liabilities)	$11.7	$(10.8)	—	$0.9
	Fair Value as of December 31, 2019
Recurring Fair Value Measures	Level 1	Level 2	Level 3	Total
Millions
Assets
Investments (a)
Available-for-sale – Equity Securities	$11.1	—	—	$11.1
Available-for-sale – Corporate and Governmental Debt Securities	—	$9.7	—	9.7
Cash Equivalents	0.9	—	—	0.9
Total Fair Value of Assets	$12.0	$9.7	—	$21.7
Liabilities
Deferred Compensation (c)	—	$21.2	—	$21.2
Total Fair Value of Liabilities	—	$21.2	—	$21.2
Total Net Fair Value of Assets (Liabilities)	$12.0	$(11.5)	—	$0.5

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

(b)As of September 30, 2020, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $2.6 million, in one year to less than three years was $4.3 million, in three years to less than five years was $3.3 million and in five or more years was $0.3 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)
September 30, 2020	$2,022.5	$2,322.1
December 31, 2019	$1,622.6	$1,791.8

(a)Excludes unamortized debt issuance costs.