Consolidated Statements of Equity - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Shareholders’ Equity	Noncontrolling Interests
Cumulative effect of accounting change	$ 24.0			$ 23.6			$ 23.6	$ 0.4
Balance, shares at Dec. 31, 2017		297.2
Balance at Dec. 31, 2017	3,152.2	$ 44.6	$ 828.3	6,210.6	$ (963.0)	$ (3,505.4)	2,615.1	537.1
Net Income	284.7			264.1			264.1	20.6
Other comprehensive income (loss)	92.9				87.9		87.9	5.0
Dividends to noncontrolling interests	(16.3)							(16.3)
Acquisition of noncontrolling interests	(34.5)		(22.8)				(22.8)	(11.7)
Increase in noncontrolling interests from business combinations	55.3							55.3
Change in temporary equity	9.1		9.1				9.1
Common stock dividends declared	(138.2)			(138.2)			(138.2)
Share-based compensation	17.5		17.5				17.5
Stock issued, share-based compensation	2.8		0.9			1.9	2.8
Common stock repurchased	(232.7)					(232.7)	(232.7)
Balance at Mar. 31, 2018	3,216.8	$ 44.6	833.0	6,360.1	(875.1)	(3,736.2)	2,626.4	590.4
Balance, shares at Mar. 31, 2018		297.2
Cumulative effect of accounting change	0.0			22.3	(22.3)		0.0	0.0
Balance, shares at Dec. 31, 2018		297.2
Balance at Dec. 31, 2018	3,106.9	$ 44.6	728.8	7,016.1	(1,228.5)	(4,013.9)	2,547.1	559.8
Net Income	279.7			263.2			263.2	16.5
Other comprehensive income (loss)	33.8				32.8		32.8	1.0
Dividends to noncontrolling interests	(17.0)							(17.0)
Acquisition of noncontrolling interests	(4.6)		0.4				0.4	(5.0)
Increase in noncontrolling interests from business combinations	1.0							1.0
Change in temporary equity	(18.2)		(18.2)				(18.2)
Common stock dividends declared	(144.6)			(144.6)			(144.6)
Share-based compensation	16.8		16.8				16.8
Stock issued, share-based compensation	1.9		(9.8)			11.7	1.9
Common stock repurchased	(286.1)					(286.1)	(286.1)
Balance at Mar. 31, 2019	$ 2,969.6	$ 44.6	$ 718.0	$ 7,157.0	$ (1,218.0)	$ (4,288.3)	$ 2,413.3	$ 556.3
Balance, shares at Mar. 31, 2019		297.2