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Consolidated Statements of Equity - USD ($)
$ in Millions
Total
Total Common Shareholders' Equity
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
Preferred Stock of Subsidiary
Balance at Dec. 31, 2014 $ 4,450.1 $ 4,419.7 $ 2.3 $ 300.1 $ 4,117.0 $ 0.3 $ 30.4
Equity              
Net income attributed to common shareholders 638.5 638.5 0.0 0.0 638.5 0.0 0.0
Other comprehensive (loss) income, net of tax 4.3 4.3 0.0 0.0 0.0 4.3 0.0
Common stock dividends (455.4) (455.4) 0.0 0.0 (455.4) 0.0 0.0
Exercise of stock options 30.1 30.1 0.0 30.1 0.0 0.0 0.0
Issuance of common stock for the acquisition of Integrys 4,072.9 4,072.9 0.9 4,072.0 0.0 0.0 0.0
Purchase of common stock (74.7) (74.7) 0.0 (74.7) 0.0 0.0 0.0
Addition of WPS preferred stock 51.1 0.0 0.0 0.0 0.0 0.0 51.1
Redemption of WPS preferred stock (52.7) (1.6) 0.0 (1.6) 0.0 0.0 (51.1)
Stock-based compensation and other 21.0 21.0 0.0 21.3 (0.3) 0.0 0.0
Balance at Dec. 31, 2015 8,685.2 8,654.8 3.2 4,347.2 4,299.8 4.6 30.4
Equity              
Net income attributed to common shareholders 939.0 939.0 0.0 0.0 939.0 0.0 0.0
Other comprehensive (loss) income, net of tax (1.7) (1.7) 0.0 0.0 0.0 (1.7) 0.0
Common stock dividends (624.9) (624.9) 0.0 0.0 (624.9) 0.0 0.0
Exercise of stock options 41.6 41.6 0.0 41.6 0.0 0.0 0.0
Purchase of common stock (108.0) (108.0) 0.0 (108.0) 0.0 0.0 0.0
Stock-based compensation and other 29.0 29.0 0.0 29.0 0.0 0.0 0.0
Balance at Dec. 31, 2016 8,960.2 8,929.8 3.2 4,309.8 4,613.9 2.9 30.4
Equity              
Cumulative effect adjustment from adoption of ASU 2016-09 15.7 15.7 0.0 0.0 15.7 0.0 0.0
Net income attributed to common shareholders 1,203.7 1,203.7 0.0 0.0 1,203.7 0.0 0.0
Other comprehensive (loss) income, net of tax 0.0            
Common stock dividends (656.5) (656.5) 0.0 0.0 (656.5) 0.0 0.0
Exercise of stock options 30.8 30.8 0.0 30.8 0.0 0.0 0.0
Purchase of common stock (71.3) (71.3) 0.0 (71.3) 0.0 0.0 0.0
Stock-based compensation and other 9.2 9.2 0.0 9.2 0.0 0.0 0.0
Balance at Dec. 31, 2017 $ 9,491.8 $ 9,461.4 $ 3.2 $ 4,278.5 $ 5,176.8 $ 2.9 $ 30.4