Fair Value (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Recurring Fair Value Measures [Table Text Block]

	Fair Value as of June 30, 2019
Recurring Fair Value Measures	Level 1		Level 2		Level 3		Total
Millions
Assets
Investments (a)
Available-for-sale – Equity Securities		$10.9	—		—			$10.9
Available-for-sale – Corporate and Governmental Debt Securities (b)	—			$9.5	—		9.5
Cash Equivalents	1.1		—		—		1.1
Total Fair Value of Assets		$12.0		$9.5	—			$21.5
Liabilities
Deferred Compensation (c)	—			$21.7	—			$21.7
Total Fair Value of Liabilities	—			$21.7	—			$21.7
Total Net Fair Value of Assets (Liabilities)		$12.0	$(12.2)		—		$(0.2)
	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
Deferred Compensation (c)	—			$19.8	—			$19.8
U.S. Water Services Contingent Consideration (d)	—		—			$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) As of June 30, 2019, the aggregate amount of available-for-sale corporate and governmental debt securities maturing in one year or less was $3.1 million, in one year to less than three years was $3.9 million, in three years to less than five years was $1.6 million and in five or more years was $0.9 million.

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

(d) Included in Other 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
June 30, 2019	$1,543.0	$1,684.3
December 31, 2018	$1,495.2	$1,534.6