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Acquisitions - Pro Forma Financial Information for Integrys Acquisition (Details) - Integrys
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
Business Acquisition [Line Items]  
Operating Revenues | $ $ 7,727.1
Net income attributed to common shareholders | $ $ 873.5
Earnings per share (Basic) | $ / shares $ 2.77
Earnings per share (Diluted) | $ / shares $ 2.75