Fair Value (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Recurring Fair Value Measures [Table Text Block]

	Fair Value as of March 31, 2020
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)	—			$9.3	—	9.3
Cash Equivalents	0.8		—		—	0.8
Total Fair Value of Assets		$9.2		$9.3	—		$18.5
Liabilities
Deferred Compensation (c)	—			$19.3	—		$19.3
Total Fair Value of Liabilities	—			$19.3	—		$19.3
Total Net Fair Value of Assets (Liabilities)		$9.2	$(10.0)		—	$(0.8)
	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 March 31, 2020, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $2.9 million, in one year to less than three years was $5.9 million, in three years to less than five years was $0.2 million and in five or more years was $0.3 million.

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

Financial Instruments [Table Text Block]

Financial Instruments	Carrying Amount	Fair Value
Millions
Long-Term Debt, Including Long-Term Debt Due Within One Year
March 31, 2020	$1,731.3	$1,880.2
December 31, 2019	$1,622.6	$1,791.8