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Acquisition (Purchase Consideration) (Details) - Jul. 01, 2016 - TECO Energy Inc [Member] $ / shares in Units, $ in Billions, $ in Billions	CAD ($)	USD ($) $ / shares
Business Combination, Consideration Transferred [Abstract]
Business Acquisition, Share Price		$ 27.55
Payments to Acquire Businesses, Gross	$ 8.4	$ 6.5
Business Combination, Consideration Transferred, Liabilities Incurred	5.5	4.2
Business Combination, Consideration Transferred	$ 13.9	$ 10.7

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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-Topic 230
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