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Fair Value (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Recurring Fair Value Measures [Table Text Block]

	Fair Value as of December 31, 2015
Recurring Fair Value Measures	Level 1				Level 2				Level 3				Total
Millions
Assets:
Investments (a)
Available-for-sale – Equity Securities		$7.6			—				—					$7.6
Available-for-sale – Corporate Debt Securities	—					$10.9			—				10.9
Cash Equivalents	2.0				—				—				2.0
Total Fair Value of Assets		$9.6				$10.9			—					$20.5
Liabilities: (b)
Deferred Compensation	—					$16.1			—					$16.1
U.S. Water Services Contingent Consideration	—				—					$36.6			36.6
Total Fair Value of Liabilities	—					$16.1				$36.6				$52.7
Total Net Fair Value of Assets (Liabilities)		$9.6			$(5.2)				$(36.6)				$(32.2)

(a) Included in Other Investments on the Consolidated Balance Sheet.

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

	Fair Value as of December 31, 2014
Recurring Fair Value Measures	Level 1				Level 2				Level 3			Total
Millions
Assets:
Investments (a)
Available-for-sale – Equity Securities		$8.1			—				—				$8.1
Available-for-sale – Corporate Debt Securities	—					$10.8			—			10.8
Cash Equivalents	2.9				—				—			2.9
Total Fair Value of Assets		$11.0				$10.8			—				$21.8
Liabilities:
Deferred Compensation (b)	—					$16.2			—				$16.2
Derivatives – Interest Rate Swap (c)	—				0.3				—			0.3
Total Fair Value of Liabilities	—					$16.5			—				$16.5
Total Net Fair Value of Assets (Liabilities)		$11.0			$(5.7)				—				$5.3

(a) Included in Other Investments on the Consolidated Balance Sheet.

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

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

Recurring Fair Value Activity in Level 3 [Table Text Block]

Recurring Fair Value Measures
Activity in Level 3
Millions
Balance as of December 31, 2014	—
Recognition of U.S. Water Services Contingent Consideration		$35.7
Accretion Expense (a)	2.4
Changes in Cash Flow Projections	(1.5		)
Balance as of December 31, 2015		$36.6

(a) Included in Interest Expense on the Consolidated Statement of Income.

Financial Instruments [Table Text Block]

Financial Instruments	Carrying Amount		Fair Value
Millions
Long-Term Debt, Including Current Portion
December 31, 2015	$1,605.0		$1,676.0
December 31, 2014	$1,373.5		$1,484.5

X

- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13467-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
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-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258

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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258

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