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Commitments and Contingent Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract] |
Schedule of water cost purchased |
|  | (Millions of Dollars) |
|  | Years Ended December 31, |
Purchased Water |  | 2016 |  |  | 2015 |  |  | 2014 |
Untreated |  | $ | 2.6 |  |  | $ | 2.5 |  |  | $ | 2.4 |
Treated |  |  | 3.2 |  |  |  | 3.1 |  |  |  | 3.1 |
Total Costs |  | $ | 5.8 |  |  | $ | 5.6 |  |  | $ | 5.5 |

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- Definition Tabular disclosure of arrangements in which the entity has agreed to procure goods or services from one or more suppliers. May include identification of the goods or services to be purchased, identity of the seller, pricing, effects on pricing for failing to reach minimum quantities required to be purchased (such as penalties), cancellation rights, and termination provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(17)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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