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)	Preferred stock of subsidiary	Noncontrolling interests
Equity
Balance		$ 9,842.7	$ 9,788.9	$ 3.2	$ 4,250.1	$ 5,538.2	$ (2.6)	$ 30.4	$ 23.4
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 income (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 income (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		10,254.6	10,113.4	3.2	4,186.6	5,927.7	(4.1)	30.4	110.8
Net income attributed to common shareholders	1,199.9	1,199.9	1,199.9	0.0	0.0	1,199.9	0.0	0.0	0.0
Net income (loss) attributed to noncontrolling interests	0.3	0.3	0.0	0.0	0.0	0.0	0.0	0.0	0.3
Other comprehensive income (loss)	(2.7)	(2.7)	(2.7)	0.0	0.0	0.0	(2.7)	0.0	0.0
Common stock dividends		(798.0)	(798.0)	0.0	0.0	(798.0)	0.0	0.0	0.0
Exercise of stock options		43.8	43.8	0.0	43.8	0.0	0.0	0.0	0.0
Purchase of common stock	(99.2)	(99.2)	(99.2)	0.0	(99.2)	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)
Acquisition of noncontrolling interests		85.0	0.0	0.0	0.0	0.0	0.0	0.0	85.0
Capital contributions from noncontrolling interest	0.0
Distributions to noncontrolling interests		(2.7)	0.0	0.0	0.0	0.0	0.0	0.0	(2.7)
Stock-based compensation and other		12.5	12.5	0.0	12.5	0.0	0.0	0.0	0.0
Balance		10,662.5	10,469.7	3.2	4,143.7	6,329.6	(6.8)	30.4	162.4
Net income attributed to common shareholders	1,300.3	1,300.3	1,300.3	0.0	0.0	1,300.3	0.0	0.0	0.0
Net income (loss) attributed to noncontrolling interests	(3.0)	(3.0)	0.0	0.0	0.0	0.0	0.0	0.0	(3.0)
Other comprehensive income (loss)	3.6	3.6	3.6	0.0	0.0	0.0	3.6	0.0	0.0
Common stock dividends		(854.8)	(854.8)	0.0	0.0	(854.8)	0.0	0.0	0.0
Exercise of stock options		15.7	15.7	0.0	15.7	0.0	0.0	0.0	0.0
Purchase of common stock	(33.1)	(33.1)	(33.1)	0.0	(33.1)	0.0	0.0	0.0	0.0
Acquisition of noncontrolling interests		6.3	0.0	0.0	0.0	0.0	0.0	0.0	6.3
Capital contributions from noncontrolling interest	$ 1.5	7.6	0.0	0.0	0.0	0.0	0.0	0.0	7.6
Distributions to noncontrolling interests		(4.1)	0.0	0.0	0.0	0.0	0.0	0.0	(4.1)
Stock-based compensation and other		12.3	11.8	0.0	11.8	0.0	0.0	0.0	0.5
Balance		$ 11,113.3	$ 10,913.2	$ 3.2	$ 4,138.1	$ 6,775.1	$ (3.2)	$ 30.4	$ 169.7