Fair Value (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Recurring Fair Value Measures [Table Text Block]

	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 (b)	—			$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 December 31, 2019, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $2.1 million, in one year to less than three years was $7.2 million, in three years to less than five years was zero and in five or more years was $0.4 million.

(c)

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

	Fair Value as of December 31, 2018
Recurring Fair Value Measures	Level 1		Level 2		Level 3		Total
Millions
Assets:
Investments (a)
Available-for-sale – Equity Securities		$12.2	—		—			$12.2
Available-for-sale – Corporate and Governmental Debt Securities	—			$8.0	—		8.0
Cash Equivalents	1.0		—		—		1.0
Total Fair Value of Assets		$13.2		$8.0	—			$21.2
Liabilities: (b)
Deferred Compensation	—			$19.8	—			$19.8
U.S. Water Services Contingent Consideration	—		—			$3.8	3.8
Total Fair Value of Liabilities	—			$19.8		$3.8		$23.6
Total Net Fair Value of Assets (Liabilities)		$13.2	$(11.8)		$(3.8)		$(2.4)

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

(b)

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
December 31, 2019	$1,622.6	$1,791.8
December 31, 2018	$1,495.2	$1,534.6