CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Distributions in Excess of Earnings	Noncontrolling Interests
BEGINNING BALANCE (shares) at Dec. 31, 2018		451,617,000	(10,557,000)
BEGINNING BALANCE at Dec. 31, 2018	$ 5,899.6	$ 4.5	$ (1,206.8)	$ 10,380.8	$ (2,642.9)	$ (1,199.5)	$ 563.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation related activity (shares)		908,000
Stock-based compensation related activity	14.7	$ 0.0		14.7
Changes in fair value of cash flow hedges, net of tax	(0.1)				(0.1)
Reclassification of unrealized losses on cash flow hedges to net income, net of tax	0.1				0.1
Foreign currency translation adjustment, net of tax	3.0				23.1		(20.1)
Distributions to noncontrolling interest	(0.3)						(0.3)
Purchase of redeemable noncontrolling interest	0.0			52.4	(52.4)
Common stock distributions declared	(399.6)					(399.6)
Net income	407.6					397.4	10.2
ENDING BALANCE (shares) at Mar. 31, 2019		452,525,000	(10,557,000)
ENDING BALANCE at Mar. 31, 2019	5,900.3	$ 4.5	$ (1,206.8)	10,447.9	(2,672.2)	(1,226.4)	553.3
BEGINNING BALANCE (shares) at Dec. 31, 2019		453,541,000	(10,651,000)
BEGINNING BALANCE at Dec. 31, 2019	5,490.4	$ 4.5	$ (1,226.4)	10,117.7	(2,823.6)	(1,016.8)	435.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation related activity (shares)		655,000
Stock-based compensation related activity	$ (4.3)	$ 0.0		(4.3)
Treasury stock activity (shares)	(213,352)		(213,000)
Treasury stock activity	$ (45.1)		$ (45.1)
Changes in fair value of cash flow hedges, net of tax	(0.0)				(0.0)
Reclassification of unrealized losses on cash flow hedges to net income, net of tax	0.0
Foreign currency translation adjustment, net of tax	(1,311.4)				(1,305.9)		(5.5)
Distributions to noncontrolling interest	(1.5)						(1.5)
Purchase of redeemable noncontrolling interest	0.0			142.2	(142.2)
Common stock distributions declared	(480.7)					(480.7)
Net income	417.2					415.0	2.2
ENDING BALANCE (shares) at Mar. 31, 2020		454,196,000	(10,864,000)
ENDING BALANCE at Mar. 31, 2020	$ 4,064.6	$ 4.5	$ (1,271.5)	$ 10,255.6	$ (4,271.7)	$ (1,082.5)	$ 430.2