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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
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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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