Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Shares [Member]	Additional Paid-In-Capital [Member]	Treasury Shares [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Total Equity Attributable to Common Shareholders [Member]	Nonredeemable Noncontrolling Interests in Consolidated Entities [Member]	Redeemable noncontrolling interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance, as adjusted	$ 7,962.2	$ 98.1	$ 6,197.7	$ (2,404.1)	$ 4,439.6	$ (446.0)	$ 7,885.3	$ 76.9	$ 393.9
Beginning balance at Dec. 31, 2015	8,695.7	98.1	6,197.7	(2,404.1)	4,439.6	(446.0)	7,885.3	810.4
Adjustment for adoption of ASU 2015-02 (Accounting Standards Update 2015-02 [Member]) at Dec. 31, 2015	(733.5)							(733.5)	226.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	158.1				161.0		161.0	(2.9)
Other comprehensive income (loss)	97.3					97.3	97.3
Change in noncontrolling interests in consolidated entities, net	(15.5)							(15.5)
Dividends	(113.0)				(113.0)		(113.0)
Employee share plans:
Share-based compensation	38.7		38.7				38.7
Vested shares			(92.6)	92.6
Other share awards	0.2			0.2		0.0	0.2	0.0
Tax impact of share-based payment	(3.9)		(3.9)				3.9
Purchase of shares	(161.6)			(161.6)			(161.6)
Ending balance at Mar. 31, 2016	7,962.5	98.1	6,139.9	(2,472.9)	4,487.6	(348.7)	7,904.0	58.5
Beginning balance at Dec. 31, 2015									167.3
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income									(0.3)
Change in noncontrolling interests in consolidated entities, net									13.7
Ending balance at Mar. 31, 2016									407.3
Beginning balance at Dec. 31, 2016	7,611.8	98.1	6,227.4	(2,845.8)	4,833.4	(809.3)	7,503.8	108.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	208.5				212.0		212.0	(3.5)
Other comprehensive income (loss)	65.6					65.6	65.6
Change in noncontrolling interests in consolidated entities, net	65.4							65.4
Dividends	(114.8)				(114.8)		(114.8)
Employee share plans:
Share-based compensation	49.2		49.2				49.2
Vested shares	0.0		(109.0)	109.0
Purchase of shares	(52.5)			(52.5)			(52.5)
Ending balance at Mar. 31, 2017	$ 7,833.2	$ 98.1	$ 6,167.6	$ (2,789.3)	$ 4,930.6	$ (743.7)	$ 7,663.3	$ 169.9
Beginning balance at Dec. 31, 2016									283.7
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income									5.7
Change in noncontrolling interests in consolidated entities, net									(81.7)
Ending balance at Mar. 31, 2017									$ 207.7