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ACQUISITIONS - Alabama Gas Corporation (Details) (Alagasco, USD $) In Millions, unless otherwise specified | 0 Months Ended |
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Sep. 02, 2014 | Sep. 02, 2014
Alagasco |  |
Business Acquisition [Line Items] |  |
Percentage of voting interest acquired |  | 100.00%
Total consideration transferred | $ 1,600.0 |
Payments to acquire businesses, net of cash acquired | $ 1,305.2 |

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