Consolidated Statements of Changes in Equity - USD ($) $ in Millions	Total	Common Shares [Member]	Additional Paid-In-Capital [Member]	Treasury Shares [Member]	Retained Earnings [Member]	Retained Earnings Appropriated for Investors in CIP [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	$ 9,102.2	$ 98.1	$ 6,133.6	$ (1,898.1)	$ 3,926.0	$ 0.0	$ 48.8	$ 8,308.4	$ 793.8
Beginning balance at Dec. 31, 2014	9,119.8	98.1	6,133.6	(1,898.1)	3,926.0	17.6	48.8	8,326.0	793.8
Adjustment for adoption of ASU 2015-02 (Accounting Standards Update 2014-13 [Member]) at Dec. 31, 2014	(17.6)	0.0	0.0	0.0	0.0	(17.6)	0.0	(17.6)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	281.9				259.6			259.6	22.3
Other comprehensive income (loss)	(302.4)						(302.4)	(302.4)		$ 0.0
Change in noncontrolling interests in consolidated entities, net	(20.3)								(20.3)
Dividends	(108.1)				(108.1)			(108.1)		0.0
Employee share plans:
Share-based compensation	40.7		40.7					40.7		0.0
Vested shares	0.0		(95.8)	(95.8)						0.0
Exercise of options	(0.7)		(0.3)	(1.0)				(0.7)		0.0
Tax impact of share-based payment	(13.0)		(13.0)					(13.0)		0.0
Purchase of shares	(134.9)			(134.9)				(134.9)		0.0
Ending balance at Mar. 31, 2015	8,872.8	98.1	6,091.2	(1,936.2)	4,077.5	$ 0.0	(253.6)	8,077.0	795.8
Beginning balance at Dec. 31, 2014										165.5
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income										2.1
Ending balance at Mar. 31, 2015										167.6
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)	0.0	0.0	0.0	0.0		0.0	0.0	(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		0.0
Change in noncontrolling interests in consolidated entities, net	(15.5)								(15.5)
Dividends	(113.0)				(113.0)			(113.0)		0.0
Employee share plans:
Share-based compensation	38.7		38.7					38.7		0.0
Vested shares	0.0		(92.6)	(92.6)						0.0
Other share awards	0.2			0.2				0.2		0.0
Tax impact of share-based payment	(3.9)		(3.9)					(3.9)		0.0
Purchase of shares	(161.6)			(161.6)				(161.6)		0.0
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
Ending balance (Accounting Standards Update 2015-02 [Member]) at Mar. 31, 2016	$ 801.0
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