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Fair Value (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value Disclosures [Abstract] |
Recurring Fair Value Measures [Table Text Block] |
| Fair Value as of December 31, 2017
Recurring Fair Value Measures | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Millions |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Investments (a) |  |  |  |  |  |  |
Available-for-sale – Equity Securities |  | $10.2 |  |  | — |  |  | — |  |  |  | $10.2 |
Available-for-sale – Corporate and Governmental Debt Securities | — |  |  |  | $8.9 |  |  | — |  |  | 8.9 |
Cash Equivalents | 3.8 |  |  | — |  |  | — |  |  | 3.8 |
Total Fair Value of Assets |  | $14.0 |  |  |  | $8.9 |  |  | — |  |  |  | $22.9 |
Liabilities: (b) |  |  |  |  |  |  |
Deferred Compensation | — |  |  |  | $18.2 |  |  | — |  |  |  | $18.2 |
U.S. Water Services Contingent Consideration | — |  |  | — |  |  |  | $5.4 |  |  | 5.4 |
Total Fair Value of Liabilities | — |  |  |  | $18.2 |  |  |  | $5.4 |  |  |  | $23.6 |
Total Net Fair Value of Assets (Liabilities) |  | $14.0 |  |  | $(9.3) |  | $(5.4) |  | $(0.7)
(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, 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 (b) | — |  |  |  | $19.8 |  |  | — |  |  |  | $19.8 |
U.S. Water Services Contingent Consideration (c) | — |  |  | — |  |  |  | $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 Investments on the Consolidated Balance Sheet.
(b) | Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.
(c) | Included in Other Current Liabilities on the Consolidated Balance Sheet.
Recurring Fair Value Measures - Activity in Level 3 [Table Text Block] |
Recurring Fair Value Measures |
Activity in Level 3 |
Millions |
Balance as of December 31, 2016 |  | $25.0 |
Accretion (a) | 0.8 |
Payments (b) | (19.7 | )
Changes in Cash Flow Projections | (0.7 | )
Balance as of December 31, 2017 |  | $5.4 |
Accretion (a) | 0.4 |
Changes in Cash Flow Projections | (2.0 | )
Balance as of December 31, 2018 |  | $3.8 |
(a) | Included in Interest Expense on the Consolidated Statement of Income.
(b) | Payments reflect the impact of a modification to the shareholder agreement in the first quarter of 2017 which provided participants a one-time election to sell shares at a determined price. Participants representing approximately half of the outstanding contingent consideration shares made the election, and were paid in 2017.
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, 2018 | $1,495.2 |  | $1,534.6
December 31, 2017 | $1,513.3 |  | $1,627.6

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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 + Details
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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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