Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative effect of accounting changes	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative effect of accounting changes	Treasury Stock	Shareholders’ Equity	Noncontrolling Interests
Cumulative effect of accounting changes			$ 728.8	$ 7,016.1	$ 22.3	$ (1,228.5)	$ (22.3)	$ (4,013.9)		$ 559.8
Beginning Balance at Dec. 31, 2018			728.8	7,016.1	22.3	(1,228.5)	(22.3)	(4,013.9)		559.8
Cumulative effect of accounting changes	$ 2,959.4	$ 44.6	726.2	7,384.7	22.3	(1,234.9)	(22.3)	(4,510.4)	$ 2,410.2	549.2
Net Income (Loss)	673.9			633.9						39.9
Other comprehensive income (loss)	16.9					15.9				1.0
Dividends to noncontrolling interests										(46.1)
Acquisition of noncontrolling interests			2.1							(6.4)
Increase in noncontrolling interests from business combinations										1.0
Change in temporary equity			(12.1)
Common stock dividends declared				(287.6)
Share-based compensation			34.3
Stock issued, share-based compensation			(26.9)					31.1
Common stock repurchased								(527.6)
Ending Balance at Jun. 30, 2019	$ 2,959.4	44.6	726.2	7,384.7		(1,234.9)		(4,510.4)	2,410.2	549.2
Dividends Declared Per Common Share	$ 1.30
Cumulative effect of accounting changes			718.0	7,157.0	0.0	(1,218.0)	0.0	(4,288.3)		556.3
Beginning Balance at Mar. 31, 2019			718.0	7,157.0	0.0	(1,218.0)	0.0	(4,288.3)		556.3
Cumulative effect of accounting changes	$ 2,959.4	44.6	726.2	7,384.7	0.0	(1,234.9)	0.0	(4,510.4)	2,410.2	549.2
Net Income (Loss)	394.1			370.7						23.4
Other comprehensive income (loss)	(16.9)					(16.9)				0.0
Dividends to noncontrolling interests										(29.1)
Acquisition of noncontrolling interests			1.7							(1.4)
Increase in noncontrolling interests from business combinations										0.0
Change in temporary equity			6.1
Common stock dividends declared				(143.0)
Share-based compensation			17.5
Stock issued, share-based compensation			(17.1)					19.4
Common stock repurchased								(241.5)
Ending Balance at Jun. 30, 2019	$ 2,959.4	$ 44.6	726.2	7,384.7		(1,234.9)		(4,510.4)	2,410.2	549.2
Dividends Declared Per Common Share	$ 0.65
Common Stock, shares issued		297.2
Cumulative effect of accounting changes	$ 2,959.4	$ 44.6	726.2	7,384.7		(1,234.9)		(4,510.4)	2,410.2	549.2
Cumulative effect of accounting changes	3,373.7		760.9	7,806.3	0.0	(1,197.6)	0.0	(4,560.3)		519.8
Beginning Balance at Dec. 31, 2019	3,373.7		760.9	7,806.3	0.0	(1,197.6)	0.0	(4,560.3)		519.8
Cumulative effect of accounting changes	2,861.4	44.6	801.2	7,759.3	0.0	(1,456.6)	0.0	(4,735.5)	2,413.0	448.4
Net Income (Loss)	257.4			234.0						23.4
Other comprehensive income (loss)	(282.1)					(259.0)				(23.1)
Dividends to noncontrolling interests										(35.2)
Acquisition of noncontrolling interests			9.9							(36.5)
Increase in noncontrolling interests from business combinations										0.0
Change in temporary equity			20.6
Common stock dividends declared				(281.0)
Share-based compensation			34.9
Stock issued, share-based compensation			(25.1)					30.0
Common stock repurchased								(205.2)
Ending Balance at Jun. 30, 2020	$ 2,861.4	44.6	801.2	7,759.3		(1,456.6)		(4,735.5)	2,413.0	448.4
Dividends Declared Per Common Share	$ 1.30
Cumulative effect of accounting changes			755.8	7,924.5	0.0	(1,528.3)	0.0	(4,749.0)		477.0
Beginning Balance at Mar. 31, 2020			755.8	7,924.5	0.0	(1,528.3)	0.0	(4,749.0)		477.0
Cumulative effect of accounting changes	$ 2,861.4	44.6	801.2	7,759.3	$ 0.0	(1,456.6)	$ 0.0	(4,735.5)	2,413.0	448.4
Net Income (Loss)	(14.4)			(24.2)						9.8
Other comprehensive income (loss)	85.9					71.7				14.2
Dividends to noncontrolling interests										(24.8)
Acquisition of noncontrolling interests			17.6							(27.8)
Increase in noncontrolling interests from business combinations										0.0
Change in temporary equity			28.8
Common stock dividends declared				(141.0)
Share-based compensation			16.2
Stock issued, share-based compensation			(17.2)					18.7
Common stock repurchased								(5.2)
Ending Balance at Jun. 30, 2020	$ 2,861.4	$ 44.6	801.2	7,759.3		(1,456.6)		(4,735.5)	2,413.0	448.4
Dividends Declared Per Common Share	$ 0.65
Common Stock, shares issued		297.2
Cumulative effect of accounting changes	$ 2,861.4	$ 44.6	$ 801.2	$ 7,759.3		$ (1,456.6)		$ (4,735.5)	$ 2,413.0	$ 448.4