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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information (unaudited) | QUARTERLY FINANCIAL INFORMATION (Unaudited)
(in millions, except per share amounts) |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total
2016 |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 2,194.8 |  |  | $ | 1,602.0 |  |  | $ | 1,712.5 |  |  | $ | 1,963.0 |  |  | $ | 7,472.3 |
Operating income |  | 589.3 |  |  | 332.1 |  |  | 399.0 |  |  | 361.7 |  |  | 1,682.1 |
Net income attributed to common shareholders |  | 346.2 |  |  | 181.4 |  |  | 217.0 |  |  | 194.4 |  |  | 939.0 |
Earnings per share * |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.10 |  |  | $ | 0.57 |  |  | $ | 0.69 |  |  | $ | 0.62 |  |  | $ | 2.98 |
Diluted |  | 1.09 |  |  | 0.57 |  |  | 0.68 |  |  | 0.61 |  |  | 2.96 |
2015 |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ | 1,387.9 |  |  | $ | 991.2 |  |  | $ | 1,698.7 |  |  | $ | 1,848.3 |  |  | $ | 5,926.1 |
Operating income |  | 358.8 |  |  | 165.8 |  |  | 345.7 |  |  | 380.2 |  |  | 1,250.5 |
Net income attributed to common shareholders |  | 195.8 |  |  | 80.9 |  |  | 182.5 |  |  | 179.3 |  |  | 638.5 |
Earnings per share * |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.87 |  |  | $ | 0.36 |  |  | $ | 0.58 |  |  | $ | 0.57 |  |  | $ | 2.36 |
Diluted |  | 0.86 |  |  | 0.35 |  |  | 0.58 |  |  | 0.57 |  |  | 2.34 |
* | Earnings per share for the individual quarters do not total the year ended earnings per share amount because of changes to the average number of shares outstanding and changes in incremental issuable shares throughout the year.
Due to various factors, including the acquisition of Integrys on June 29, 2015, the quarterly results of operations are not necessarily comparable.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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