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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 loss	Preferred stock of subsidiary	Noncontrolling interests
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
Statements of equity
Net income attributed to common shareholders	420.1	420.1	0.0	0.0	420.1	0.0	0.0	0.0
Other comprehensive income (loss)	(1.4)	(1.4)	0.0	0.0	0.0	(1.4)	0.0	0.0
Common stock dividends	(186.2)	(186.2)	0.0	0.0	(186.2)	0.0	0.0	0.0
Exercise of stock options	32.6	32.6	0.0	32.6	0.0	0.0	0.0	0.0
Purchase of common stock	(70.7)	(70.7)	0.0	(70.7)	0.0	0.0	0.0	0.0
Acquisition of a noncontrolling interest	69.0	0.0	0.0	0.0	0.0	0.0	0.0	69.0
Capital contributions from noncontrolling interest	4.8	0.0	0.0	0.0	0.0	0.0	0.0	4.8
Stock-based compensation and other	1.2	1.2	0.0	1.2	0.0	0.0	0.0	0.0
Balance at Mar. 31, 2019	10,112.1	9,984.5	3.2	4,213.2	5,772.1	(4.0)	30.4	97.2
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
Statements of equity
Net income attributed to common shareholders	890.1
Net income (loss) attributed to noncontrolling interests	(0.5)
Other comprehensive income (loss)	(4.5)
Capital contributions from noncontrolling interest	14.6
Balance at Sep. 30, 2019	10,186.4	10,051.0	3.2	4,185.0	5,869.9	(7.1)	30.4	105.0
Balance at Mar. 31, 2019	10,112.1	9,984.5	3.2	4,213.2	5,772.1	(4.0)	30.4	97.2
Statements of equity
Net income attributed to common shareholders	235.7	235.7	0.0	0.0	235.7	0.0	0.0	0.0
Net income (loss) attributed to noncontrolling interests	(0.2)	0.0	0.0	0.0	0.0	0.0	0.0	(0.2)
Other comprehensive income (loss)	(2.6)	(2.6)	0.0	0.0	0.0	(2.6)	0.0	0.0
Common stock dividends	(186.1)	(186.1)	0.0	0.0	(186.1)	0.0	0.0	0.0
Exercise of stock options	17.5	17.5	0.0	17.5	0.0	0.0	0.0	0.0
Purchase of common stock	(35.6)	(35.6)	0.0	(35.6)	0.0	0.0	0.0	0.0
Capital contributions from noncontrolling interest	5.5	0.0	0.0	0.0	0.0	0.0	0.0	5.5
Distributions to noncontrolling interests	(0.9)	0.0	0.0	0.0	0.0	0.0	0.0	(0.9)
Stock-based compensation and other	2.9	2.8	0.0	2.8	0.0	0.0	0.0	0.1
Balance at Jun. 30, 2019	10,148.3	10,016.2	3.2	4,197.9	5,821.7	(6.6)	30.4	101.7
Statements of equity
Net income attributed to common shareholders	234.3	234.3	0.0	0.0	234.3	0.0	0.0	0.0
Net income (loss) attributed to noncontrolling interests	(0.3)	0.0	0.0	0.0	0.0	0.0	0.0	(0.3)
Other comprehensive income (loss)	(0.5)	(0.5)	0.0	0.0	0.0	(0.5)	0.0	0.0
Common stock dividends	(186.1)	(186.1)	0.0	0.0	(186.1)	0.0	0.0	0.0
Exercise of stock options	16.0	16.0	0.0	16.0	0.0	0.0	0.0	0.0
Purchase of common stock	(31.9)	(31.9)	0.0	(31.9)	0.0	0.0	0.0	0.0
Capital contributions from noncontrolling interest	4.3	0.0	0.0	0.0	0.0	0.0	0.0	4.3
Distributions to noncontrolling interests	(0.6)	0.0	0.0	0.0	0.0	0.0	0.0	(0.6)
Stock-based compensation and other	2.9	3.0	0.0	3.0	0.0	0.0	0.0	(0.1)
Balance at Sep. 30, 2019	10,186.4	10,051.0	3.2	4,185.0	5,869.9	(7.1)	30.4	105.0
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
Statements of equity
Net income attributed to common shareholders	452.5	452.5	0.0	0.0	452.5	0.0	0.0	0.0
Net income (loss) attributed to noncontrolling interests	(0.2)	0.0	0.0	0.0	0.0	0.0	0.0	(0.2)
Other comprehensive income (loss)	(3.0)	(3.0)	0.0	0.0	0.0	(3.0)	0.0	0.0
Common stock dividends	(199.5)	(199.5)	0.0	0.0	(199.5)	0.0	0.0	0.0
Exercise of stock options	16.0	16.0	0.0	16.0	0.0	0.0	0.0	0.0
Purchase of common stock	(40.4)	(40.4)	0.0	(40.4)	0.0	0.0	0.0	0.0
Distributions to noncontrolling interests	(0.5)	0.0	0.0	0.0	0.0	0.0	0.0	(0.5)
Stock-based compensation and other	5.1	5.1	0.0	5.1	0.0	0.0	0.0	0.0
Balance at Mar. 31, 2020	10,484.6	10,344.1	3.2	4,167.3	6,180.7	(7.1)	30.4	110.1
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
Statements of equity
Net income attributed to common shareholders	960.9
Net income (loss) attributed to noncontrolling interests	0.0
Other comprehensive income (loss)	(2.3)
Capital contributions from noncontrolling interest	0.0
Balance at Sep. 30, 2020	10,559.1	10,450.7	3.2	4,163.8	6,290.1	(6.4)	30.4	78.0
Balance at Mar. 31, 2020	10,484.6	10,344.1	3.2	4,167.3	6,180.7	(7.1)	30.4	110.1
Statements of equity
Net income attributed to common shareholders	241.6	241.6	0.0	0.0	241.6	0.0	0.0	0.0
Net income (loss) attributed to noncontrolling interests	0.2	0.0	0.0	0.0	0.0	0.0	0.0	0.2
Other comprehensive income (loss)	(0.2)	(0.2)	0.0	0.0	0.0	(0.2)	0.0	0.0
Common stock dividends	(199.5)	(199.5)	0.0	0.0	(199.5)	0.0	0.0	0.0
Exercise of stock options	4.3	4.3	0.0	4.3	0.0	0.0	0.0	0.0
Purchase of common stock	(9.9)	(9.9)	0.0	(9.9)	0.0	0.0	0.0	0.0
Purchase of additional ownership interest in Upstream from noncontrolling interest	(31.0)	0.0	0.0	0.0	0.0	0.0	0.0	(31.0)
Distributions to noncontrolling interests	(0.7)	0.0	0.0	0.0	0.0	0.0	0.0	(0.7)
Stock-based compensation and other	3.3	3.3	0.0	3.3	0.0	0.0	0.0	0.0
Balance at Jun. 30, 2020	10,492.7	10,383.7	3.2	4,165.0	6,222.8	(7.3)	30.4	78.6
Statements of equity
Net income attributed to common shareholders	266.8	266.8	0.0	0.0	266.8	0.0	0.0	0.0
Net income (loss) attributed to noncontrolling interests	0.0
Other comprehensive income (loss)	0.9	0.9	0.0	0.0	0.0	0.9	0.0	0.0
Common stock dividends	(199.5)	(199.5)	0.0	0.0	(199.5)	0.0	0.0	0.0
Exercise of stock options	3.0	3.0	0.0	3.0	0.0	0.0	0.0	0.0
Purchase of common stock	(6.4)	(6.4)	0.0	(6.4)	0.0	0.0	0.0	0.0
Distributions to noncontrolling interests	(0.6)	0.0	0.0	0.0	0.0	0.0	0.0	(0.6)
Stock-based compensation and other	2.2	2.2	0.0	2.2	0.0	0.0	0.0	0.0
Balance at Sep. 30, 2020	$ 10,559.1	$ 10,450.7	$ 3.2	$ 4,163.8	$ 6,290.1	$ (6.4)	$ 30.4	$ 78.0

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Value of stock issued as a result of the exercise of stock options.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.

+ References

No definition available.

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