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CONDENSED 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
Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cumulative effect adjustment from ASU 2016-09 $ 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributed to common shareholders 771.1 771.1 0.0 0.0 771.1 0.0 0.0 0.0
Other comprehensive loss (0.5) (0.5) 0.0 0.0 0.0 (0.5) 0.0 0.0
Common stock dividends (492.4) (492.4) 0.0 0.0 (492.4) 0.0 0.0 0.0
Exercise of stock options 25.6 25.6 0.0 25.6 0.0 0.0 0.0 0.0
Purchase of common stock (60.6) (60.6) 0.0 (60.6) 0.0 0.0 0.0 0.0
Stock-based compensation and other 6.6 6.6 0.0 6.6 0.0 0.0 0.0 0.0
Balance at Sep. 30, 2017 9,225.7 9,195.3 3.2 4,281.4 4,908.3 2.4 30.4 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributed to common shareholders 854.3 854.3 0.0 0.0 854.3 0.0 0.0 0.0
Other comprehensive loss (0.5) (0.5) 0.0 0.0 0.0 (0.5) 0.0 0.0
Common stock dividends (523.0) (523.0) 0.0 0.0 (523.0) 0.0 0.0 0.0
Exercise of stock options 13.9 13.9 0.0 13.9 0.0 0.0 0.0 0.0
Purchase of common stock (42.0) (42.0) 0.0 (42.0) 0.0 0.0 0.0 0.0
Acquisition of a noncontrolling interest in subsidiary 37.0 0.0 0.0 0.0 0.0 0.0 0.0 37.0
Stock-based compensation and other 11.2 11.2 0.0 11.2 0.0 0.0 0.0 0.0
Balance at Sep. 30, 2018 $ 9,842.7 $ 9,775.3 $ 3.2 $ 4,261.6 $ 5,508.1 $ 2.4 $ 30.4 $ 37.0