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Consolidated Statements of Equity - USD ($)
$ in Millions
Total
Total Equity
Total Common Shareholders' Equity
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Other
ASU 2018-02 Reclassification from AOCI, Tax Effect
Preferred Stock of Subsidiary
Noncontrolling Interests
Balance at Dec. 31, 2015   $ 8,685.2 $ 8,654.8 $ 3.2 $ 4,347.2 $ 4,299.8 $ 4.6     $ 30.4 $ 0.0
Equity                      
Net income attributed to common shareholders $ 939.0 939.0 939.0 0.0 0.0 939.0 0.0     0.0 0.0
Other comprehensive loss, net of tax (1.7)   (1.7) 0.0 0.0 0.0 (1.7)     0.0 0.0
Common stock dividends   (624.9) (624.9) 0.0 0.0 (624.9) 0.0     0.0 0.0
Exercise of stock options   41.6 41.6 0.0 41.6 0.0 0.0     0.0 0.0
Purchase of common stock (108.0) (108.0) (108.0) 0.0 (108.0) 0.0 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 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 0.0
Equity                      
Cumulative effect adjustment from new accounting principle   15.7 15.7 0.0 0.0 15.7 0.0     0.0 0.0
Net income attributed to common shareholders 1,203.7 1,203.7 1,203.7 0.0 0.0 1,203.7 0.0     0.0 0.0
Other comprehensive loss, net of tax 0.0                    
Common stock dividends   (656.5) (656.5) 0.0 0.0 (656.5) 0.0     0.0 0.0
Exercise of stock options   30.8 30.8 0.0 30.8 0.0 0.0     0.0 0.0
Purchase of common stock (71.3) (71.3) (71.3) 0.0 (71.3) 0.0 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 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 0.0
Equity                      
Cumulative effect adjustment from new accounting principle   0.0 0.0 0.0 0.0 (0.6)     $ 0.6 0.0 0.0
Net income attributed to common shareholders 1,059.3 1,059.3 1,059.3 0.0 0.0 1,059.3 0.0     0.0 0.0
Other comprehensive loss, net of tax (5.5) (6.1) (6.1) 0.0 0.0 0.0   $ (6.1)   0.0 0.0
Common stock dividends   (697.3) (697.3) 0.0 0.0 (697.3) 0.0     0.0 0.0
Exercise of stock options   29.1 29.1 0.0 29.1 0.0 0.0     0.0 0.0
Purchase of common stock $ (72.4) (72.4) (72.4) 0.0 (72.4) 0.0 0.0     0.0 0.0
Acquisition of noncontrolling interests   23.8 0.0 0.0 0.0 0.0 0.0     0.0 23.8
Stock-based compensation and other   14.5 14.9 0.0 14.9 0.0 0.0     0.0 (0.4)
Balance at Dec. 31, 2018   $ 9,842.7 $ 9,788.9 $ 3.2 $ 4,250.1 $ 5,538.2 $ (2.6)     $ 30.4 $ 23.4