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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 (Loss)
Other Comprehensive Loss
ASU 2018-02 Cumulative Effect Adjustment
Preferred Stock of Subsidiary
Noncontrolling Interests
Equity                      
Cumulative effect adjustment from new accounting principle   $ 15.7 $ 15.7 $ 0.0 $ 0.0 $ 15.7 $ 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                      
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
Net loss attributed to noncontrolling interests 0.0                    
Other comprehensive loss 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
Capital contributions from noncontrolling interest 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
Net loss attributed to noncontrolling interests 0.0                    
Other comprehensive loss (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
Capital contributions from noncontrolling interest 0.0                    
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
Equity                      
Net income attributed to common shareholders 1,134.0 1,134.0 1,134.0 0.0 0.0 1,134.0 0.0     0.0 0.0
Net loss attributed to noncontrolling interests 0.5 (0.5) 0.0 0.0 0.0 0.0 0.0     0.0 (0.5)
Other comprehensive loss (1.5) (1.5) (1.5) 0.0 0.0 0.0 (1.5)     0.0 0.0
Common stock dividends   (744.5) (744.5) 0.0 0.0 (744.5) 0.0     0.0 0.0
Exercise of stock options   67.0 67.0 0.0 67.0 0.0 0.0     0.0 0.0
Purchase of common stock (140.1) (140.1) (140.1) 0.0 (140.1) 0.0 0.0     0.0 0.0
Acquisition of noncontrolling interests   69.0 0.0 0.0 0.0 0.0 0.0     0.0 69.0
Capital contributions from noncontrolling interest $ 21.0 21.0 0.0 0.0 0.0 0.0 0.0     0.0 21.0
Distributions to noncontrolling interests   (2.1) 0.0 0.0 0.0 0.0 0.0     0.0 (2.1)
Stock-based compensation and other   9.6 9.6 0.0 9.6 0.0 0.0     0.0 0.0
Balance at Dec. 31, 2019   $ 10,254.6 $ 10,113.4 $ 3.2 $ 4,186.6 $ 5,927.7 $ (4.1)     $ 30.4 $ 110.8